I think the character everyone assumes is Toad is actually Skin. His fingers even have a weird shape to them. And I assume Psylocke is being confused for one of the M Twins.
It is an rather random line up. You got some Generation X members, a Brotherhood member, a Marauder, some unknowns, and like three actual X-Men.
I don't think its just fan speculation here either. I think a lot of the locked up mutants in Wolverine were actually supposed to be real comic characters. Singer used new mutants instead of comic cameos in his films a lot, but on the Wolverine film it felt like they had a prerogative to make every possible mutant be a character from the books to make the fans want to see this film. Most of the named mutants like Emma and Cyclops can be replaced by completely original characters and it would make little difference.