re: WSJ: Sony will use Gaikai streaming tech to play PS3 games on the PS4(Posted by oauron on 2/15/13 at 9:00 pm to UltimateHog)
Had to be coming with PS4. Sony would spend the cash on Gaikai in a time where they're cutting back if it wasn't going to be a major focus of the console.
I think it's a very good way to differentiate yourself. It'll be required for any hope of "next-gen" to have any success at all.