ToyFare exclusive that's un-made... Havok, Morph, Yellow DD, Wonder Man, Feral, Shadowcat, Guardian, Bullseye, Union Jack, and Firestar have all been made before. Multiple Man's been done, but in a different costume. It looks like the only two that haven't seen any sort of release are Synch and Earth X Venom? Not so sure how well either of them fits with the "recently used theme" hint, though, since Generation X and Earth X have yet to be touched. Maybe I missed someone?
EDIT: I Did miss someone--Molten Man. He's not had a figure, and could fit with a Spider-themed wave