We're getting PS2 games on the PS4 when Battlefront comes out, so a PSX announcement would be too late. Really the only question is if Sony will let us play our discs too, and considering they said nothing at TGS I'm starting to get a little pessimistic about it. I can't imagine what their excuse would be though, especially after MS's BC announcement. If it's like classics on the PS3 they'll just start releasing PS2 games and say nothing beyond a footnote on the PS Blog.