Near as I can tell, these are the big guns we've got left that haven't been released yet (those guys we know are in the game or likely in the game, not speculating on ones we haven't seen before).
The guys who could be 99s of some sort based on career: Cy Young, Mays, Lefty Grove, Joe Morgan, Spahn (not sure if he's in this year), Robin Roberts, Fergie, Griffey, Brooks Robinson, Verlander, Miggy Cabrera, Eddie Murray, Edgar Martinez, McCovey, Eckersley and, maybe, Cano (but I doubt he gets a 99).
Also, here are some MVP and Cy Young award possibilities that either don't already have their best possible card and aren't listed above.
MVP: Mookie, Bellinger, Stanton, Braun, Giambi, Dale Murphy, Keith Hernandez, Stargell.
Cy: deGrom, Snell, Porcello, Keuchel, Arrieta, David Price, Colon, Bedrosian, Bruce Sutter.
Just thought I'd throw this out there for those in the planning stages. I did this for myself to think out what I wanted to do because I'm spending a bunch of stubs knowing there isn't a ton of great stuff ahead and I don't want to spend up on the BR cards. I also dont' have a huge interest in finest and I'm not going to worry about TA4 because who knows how long it's still to come.