Here's my shortlist. I updated it to include recent eBay sales prices:
| eBay Sale $ | Sold/Unsold? | |||
| 1 | 1952 | Willie Mays | $2,500.00 | Unsold |
| 2 | 1952 | Mickey Mantle | ||
| 3 | 1952 | Ed Mathews | ||
| 4 | 1954 | Al Kaline | ||
| 5 | 1954 | Ernie Banks | ||
| 6 | 1954 | Henry Aaron | ||
| 7 | 1955 | Sandy Koufax | ||
| 8 | 1955 | Roberto Clemente | ||
| 9 | 1955 | Harmon Killebrew | ||
| 10 | 1956 | Luis Aparicio | ||
| 11 | 1957 | Jim Bunning | ||
| 12 | 1957 | Brooks Robinson | ||
| 13 | 1957 | Frank Robinson | ||
| 14 | 1957 | Don Drysdale | ||
| 15 | 1958 | Orlando Cepeda | ||
| 16 | 1958 | Roger Maris | ||
| 17 | 1959 | Bob Gibson | ||
| 18 | 1960 | Carl Yastrzemski | ||
| 19 | 1960 | Willie McCovey | ||
| 20 | 1961 | Billy Williams | ||
| 21 | 1961 | Juan Marichal | ||
| 22 | 1962 | Lou Brock | ||
| 23 | 1962 | Gaylord Perry | ||
| 24 | 1963 | Willie Stargell | ||
| 25 | 1963 | Pete Rose | ||
| 26 | 1964 | Phil Niekro | ||
| 27 | 1965 | Steve Carlton | ||
| 28 | 1965 | Joe Morgan | ||
| 29 | 1965 | Tony Perez | ||
| 30 | 1965 | Jim Hunter | ||
| 31 | 1966 | Ferguson Jenkins | ||
| 32 | 1966 | Jim Palmer | ||
| 33 | 1967 | Rod Carew | ||
| 34 | 1967 | Tom Seaver | ||
| 35 | 1968 | Johnny Bench | ||
| 36 | 1968 | Nolan Ryan | $899.00 | Unsold |
| 37 | 1969 | Reggie Jackson | ||
| 38 | 1972 | Carlton Fisk | ||
| 39 | 1973 | Mike Schmidt | $127.50 | Sold |
| 40 | 1974 | Dave Winfield | ||
| 41 | 1975 | Jim Rice | $46.98 | Sold |
| 42 | 1975 | Gary Carter | ||
| 43 | 1975 | Robin Yount | ||
| 44 | 1975 | George Brett | ||
| 45 | 1976 | Dennis Eckersley | ||
| 46 | 1978 | Eddie Murray | $22.49 | Sold |
| 47 | 1979 | Ozzie Smith | ||
| 48 | 1980 | Rickey Henderson | ||
| 49 | 1982 | Cal Ripken Jr. | ||
| 50 | 1983 | Tony Gwynn | ||
| 1984 | Darryl Strawberry | $7.50 | Sold | |
| 1984 | Dwight Gooden | $36.01 | Sold | |
| 1990 | Frank Thomas | $51.00 | Sold |
Update 5/9/14 - Am I missing something here? Why is a Frank Thomas rookie card—usually $4 max—selling for $51?!? Seriously, what is wrong with this picture? The thing about all of these newer cards being included in this buyback program is that it means a more hallowed card from the Fifties (or Sixties or Seventies) is not included. Thomas I understand. Darryl Strawberry I do not.
Update 3/12/14 - Not only is it interesting that Dwight Gooden is considered a top-50 rookie, but that it sold for $36.01! If this is his card from 1984 Topps, we're talking about a $3 card, at best. Why would you pay 12 times that much for the same card? So with Gooden and Strawberry in the top 50, my thinking now is that a couple from the 1960s didn't make the cut.
Update 2/19/14 - It looks like Darryl Strawberry's 1984 Topps rookie made the cut. A redemption card recently sold for $7.50 on eBay (2/17/14). This means that (at least) one of the cards listed above is not included as a buyback.
Bolded entries are cards that have been offered for sale on eBay, confirming they're being offered as part of this buyback insert.
Taking into consideration that these cards are buybacks, that would lead me to believe that they'll all be vintage, and that Topps wouldn't go to great lengths to buy back a 1989 Topps Traded Ken Griffey Jr. card and release it as part of this set, even if you could make a legitimate case that Griffey's rookie is one of the company's top 50.
"Rookie" is a tricky word here, though, as Mays's and Mantle's 1952 cards are not technically rookies, as both players' rookies are in the 1951 Bowman set. That said, my list does not include Bowman cards; if we're including Bowman, then Albert Pujols's 2001 Bowman Chrome autographed rookie would definitely be included above.
Another point is whether Topps includes Pete Rose's rookie, or if it opts to go with someone safer, like Don Mattingly or Bert Blyleven. As a collector, you'd hope that they'd include Rose, as it's the right thing to do. But remember how Topps didn't mention Rose by name as the all-time hits leader on the backs of cards in 2013's flagship set? I distinctly remember the company line being that their action was the "right thing to do" (I'm paraphrasing here). So when it comes to Rose, the "right thing to do" has one meaning inside the walls of One Whitehall and a decidedly different meaning in the rest of the world.
It will be interesting to see whose rookies are included in the official checklist, and what sort of hoopla this set will generate.
Another update: What's also interesting about this buyback is how much these cards are reselling for. I think you can chalk the high Rice price up to a newness factor, and that the buyback redemption was pretty much unexplained at the time of the sale. I can't think of any other reason why someone would pay 5x the going rate for a Jim Rice rookie card. (In fact, the Schmidt went for about double the going rate for an ungraded version of this card.) The Ryan has been offered three times with no purchase: $1,499; $999; and $899, though all as a fixed-price "Buy it Now." The Murray, Rice, and Schmidt cards have been offered as straight auctions.
One final thing: It has not been advertised if the cards received will be raw or graded. I'm pretty sure Topps would announce the cards as graded if it were the case, so if the cards received are raw, what condition will they be in? Did someone just pay nearly $47 for a Jim Rice rookie card in very good condition?
Another update: What's also interesting about this buyback is how much these cards are reselling for. I think you can chalk the high Rice price up to a newness factor, and that the buyback redemption was pretty much unexplained at the time of the sale. I can't think of any other reason why someone would pay 5x the going rate for a Jim Rice rookie card. (In fact, the Schmidt went for about double the going rate for an ungraded version of this card.) The Ryan has been offered three times with no purchase: $1,499; $999; and $899, though all as a fixed-price "Buy it Now." The Murray, Rice, and Schmidt cards have been offered as straight auctions.
One final thing: It has not been advertised if the cards received will be raw or graded. I'm pretty sure Topps would announce the cards as graded if it were the case, so if the cards received are raw, what condition will they be in? Did someone just pay nearly $47 for a Jim Rice rookie card in very good condition?



In a conversation with Andy of the 




As I mentioned above, this set was blessed with a strong rookie class (beyond just those on their ways to long minor league careers), made stronger because with no insert sets to speak of, there was nowhere for them to hide but amongst their team set. Rookies of guys either destined for the Hall of Fame or the Veterans Committee ballot like Chipper Jones, Jeff Bagwell, Jim Thome, Ivan Rodriguez, Mike Mussina, Javy Lopez, Kenny Lofton, Tim Salmon and Luis Gonzalez and other guys like Rondell White, Reggie Sanders, Ryan Klesko, Raul Mondesi (yeaahhh boy-eee!), Mike Lieberthal, Jeromy Burnitz, Roberto “Father Time” Hernandez, Bret Boone, Jeff Conine, a flameout like Todd Van Poppel and the colossal jerk Carl “Someday I’ll Head-butt an Umpire” Everett; all of them got their start in 1991 Bowman. This is not to say that other sets didn't feature one or most of these guys as well, but all of them together in a one-series regular set? Bowman was your only option. 


A couple fun things about Wasdin. The back of this card is just classic Topps: two photos on the back that are exactly the same. Good times. Also, although he's out of the game, he's in MLB: The Show 06, which I still play (I'm in season nine of my Red Sox franchise). And no matter how many runs I'm down, if the computer puts Wasdin in the game, I know I'll be able to tie the score or take the lead in one inning. I mean, he wasn't called Way Back Wasdin for nothing.
1974 is a classic example of ‘the strongly designed set’, or a set where the main graphical element is present on every card. In ’74’s case, it’s the streamlined pennant (stolen and reconfigured from the classic design of 1965) on nearly every card. Those goddamn pennants…they’re ugly as hell, and you sure do get sick of them after about 20 cards, but you have to hand it to those Topps designers, because six years later in 1980 they take the same tired pennants, skew them 45 degrees and somehow make everything seem pleasing and fresh. 
series Traded series and then put out a special hero-worship subset in the 1975 set. That would’ve catapulted 1975 into the top ten sets ever made. Can you imagine? Cards 653-659 could’ve been ‘Hank Aaron Years’ cards, with card #660—his penultimate regular card, with maybe a photo of him at his car lot down in Atlanta, or smoking a cigar at home plate, or pushing away shaggy Braves fans as he rounded third, or, wait for it, a photo of him as a young call up for the Boston Braves in ’53? How about that?), which is just too bad, because there are a number of signs that this set is the quintessential one-step-away-from-greatness set, the ‘Biding Our Time’ set, the ‘Wait Til Next Year’ set…really, besides the Hank Aaron cards and the Winfield rookie, this set is a load of garbage.
Let me back that wild claim up with some rockhard facts. Not too many subsets, and these Seventies sets almost live or die on their subset inventiveness. 1972 had a late-series ‘Traded’ subset, 1975 had the MVPs through the years, 1977 had ‘Big League Brothers’ featuring the shell-shocked Reuschels. 1976 had the All-Time Team. 1972 had ‘In Action’ and a few ‘Boyhood Photos of the Stars’. 1973 had some more Boyhood Photos, including one of Catfish Hunter clutching a farm animal. What did 1974 have besides the Aaron Hero-Worship to open the set? World Series cards, dual-league leaders, All-Stars and a team variation. I guess you have to also count the Traded series as a subset for this set, but since I’ve already counted it separately, let’s forget it. Also, forget the team variation as a legitimate subset. So that leaves us with three subsets that were by this time pretty tired. OK, next.
awesome and big shots like Elliott Gould, Tom Seaver and Karen Black would come by, like, all the time, and the difference between my place and The Factory would be that instead of sitting around and trying to act all cool in front of each other, we’d sit around and make shit. Hell, we’d sit at long tables and make shit for hours, well, the celebrities would sit, and make stuff, like pot holders and fake designer handbags and leather boots, and I’d sit in my air conditioned office and talk with suppliers on the phone and then come out periodically to make sure that everybody was having a good time. And if they weren’t—and I’m talking big shots here, like Bud Harrelson and Clyde Frazier, Harvey Keitel and Henry Kissinger—well, then I’d launch into a long-winded speech on why Gus Triandos was completely undeserving of a 2nd Tier number in the meritocracy of the Topps checklisting universe of the 1960s…and they'd snap right back to work, because I happen to feel strongly about that and can go on about it for a long time (and really nobody wants that)...
Well, I was wrong. I would have to say that 1975 and dark horse 1971 are tied for strongest rookie class, though 1977 is by far my favorite. Any set boasting rookies of Barker, Templeton and The Bird—all three of which I can probably purchase for under a dollar combined—is a friend of mine. But anyway, you see what I mean about the Seventies: these sets don’t have more than one or two worthwhile rookies each, which is a shame. Especially in the case of 1974, since there aren’t many other reasons to collect it.