As of now, no word on cross-compatibility features between PS3 and PS Vita versions.
Sony itself has answered that question and unveiled a whole lot more concerning the game’s handheld version.
SCEE’s Alex Moyet stated the game would be a port of the PS3 version and in the comments for the PS Blog post, stated that it “will be optimised for the Vita hardware”. There will also be a new two player mode via Wi-Fi, and that the Vita version n “will definitely fix some of those technical issues previously experienced such as framerate and AI”.
It’s also been revealed that Blitz Games Studios, who handled the PS3 and Xbox 360 versions, is working with Sony on porting duties. As of now, there’s no news on whether that Vita and PS3 versions will have cross-play or cross-save support.