Probably just unveiling there will be next gen versions, which I think everyone was expecting right from the get go anyways. That engine stuck on PS3/360/possibly Wii U would obviously just be a waste.
The only thing I CAN think they might do that would actually be shocking is if the next gen version is exclusively PS4 (that is, still multiplat on current/then last gen consoles, just not on the One). It would make sense of the PS4 exclusive rumors at least since obviously going back on a 360 that had already been announced would only end badly.











