In these days? lol, nothing! Most games are the same shit from the past: KOF? XIII returned to the classic 3 on 3 2002/98 style. SF? lol, SFIV = SF2.5D. Tekken? Almost the same from Tekken 4 onwards (probly TTT2 might change that). BlazBlue? lol, hello Guilty Gear, we missed you.
We are in a dark age of creative productions, in gaming, in movies, in books, in everything. Nothing reinvents itself anymore, everything's about remakes, reimaginations, rehashes and using recycled formulas.