I do want to point out that although the PS3 and PS4 have different processors, and emulation engine wont be that hard for Sony to program, since they have both system architectures and understand how each work, which is most likely going to lead into a code translation program being set up inside the emulation engine for PS3 games, if and when they decide to implement it, as the backward compatibility is probably going to be handles like the PS3's, but in reverse, so going from none- to at least one generation back.