Yeah, they haven't revealed any details on how the PS3 version will look like yet.
While it's safe to assume that the PS4 version will be identical to the arcade, they may tone down the graphics in some way to have it run on PS3.
With that said, though, I don't think it will be much of a difference. Despite how awesome the game looks, it's still just cel shaded models, just very well done, at a level we've never seen before. And if you look at the announcement trailers that show the models close up, their polygon count is not that high, you can see plenty of sharp edges.