It's not really a fighting game, but it is another apocalypse/survival type game, called The Last Of Us.
I want to bring it up because the developers (NaughtyDog) use a new type of AI system where enemies, as well as your AI teammate, react to everything in their environment, down to even what weapon you're holding. On top of that NaughtyDog made the Uncharted series, and they used the same engine for their graphics in this game which is loving SWEET. Plus the storyline, character development and environment looks amazing/beautiful.
Something I'm looking forward to.