Only bit of info I could find is on a site called venturebeat(new-injustice-game-shows-what-tech-improvements-we-can-get-from-ps3-to-ps4), cant post the link here b/c of restriction but heres the good stuff:
"First, the game will run at a resolution of 1080p on the PlayStation 4, meaning it’s as sharp as it can be for most high-definition televisions (compare this to 720p for the first Injustice)."
"So the textures on the characters are probably about 4X what they were on the PS3.”"
"PlayStation 4 owners will also see all in-game button prompts (aka, quick-time events, as seen in the single-player campaign or the S.T.A.R. Labs Missions) replaced with controller touch pad swipes."
"Bottom line? “In general, you’re just going to see better-looking art,” said Urbano."
"The PS4 Injustice also gets an exclusive character skin: a New 52 Black Adam, from the DC Comics reboot. "
"Owners of the PlayStation 3 version of Injustice can upgrade to the digital PS4 Ultimate Edition for $10."
<message edited by Gamerdog on Wednesday, November 13, 2013 4:45 AM>