I'd be surprised if they don't have custom graphics hardware, of some sort, in there - I imagine the last thing Sony wants is to commoditise themselves by providing the same hardware platform as normal Android phones.

Even if they don't have custom hardware, I'd be shocked if they didn't have some sort of silicon DRM to stop the software running elsewhere.

Only if Sony doesn't do a thing to lock the software up. Maybe they could add SPUs to the phone, or something that would lock the software to the platform.