I just reviewed the games I own digitally, here's the ones that are not currently BC that I'd like to be:
After Burner Climax (presumably never going to happen since it was delisted),
Crackdown (presumably will happen at some point),
Bionic Commando: Rearmed,
Child of Eden,
Crysis 2,
Dead Rising 2 (would be nice but fairly redundant, since there is a native Xbox One version),
Dust: An Elysian Tail (never actually played this),
Fez,
Marvel vs. Capcom 2 (presumably never going to happen since it was delisted),
Resident Evil 4 (would be nice but fairly redundant, since there is a native Xbox One version),
Rez HD (not too concerned about this since I have it on PS4 now, I wonder if that version will ever hit Xbox One),
Rockstar Table Tennis.
I'm pretty impressed that the bulk of my digital 360 library is available. I got rid of my 360 + games on disc a few years ago, but the selection has grown at a solid rate.