I've thought about this. Maybe like a MASSIVE collaboration, where each side can have power ups that come specifically from each one's own exclusives. Like PS3 players would be able to pilot Geckos (MGS4) and 360 players would be able to have warthogs.
It would be like a Smash Brothers with a mash up of tons of games, but in an FPS.
Sorry I got a little off-topic, I think if gameplay was solid and it was marketed properly it could definitely sell
Platinums: Red Dead Redemption, Killzone 2, LittleBigPlanet, Terminator Salvation, Uncharted 1, inFamous Second Son, Rocket League







