I remember reading on Kotaku that Sony actually filed for some sort of "PS2 software emulation on PS3" patent just a couple of months ago. This could mean two things:
1) They'll offer PS2 titles as downloads only from their network store.
2) They patented it to stop 3rd parties from offering similar emulators, so you cannot play PS2 discs/roms on the PS3, and have to purchase the games again from their network store.![]()