Yeah, the backwards campatiblity with streaming games is great and all, but that's just going to make me pay for my current PS3 games again just to have them in digital form. In a perfect world, they'd set up a system where you could at least prove that you own Game X, and in turn get a free digital copy of that game. :P Not that many of the games I own would be too expensive anymore, but that's probably gonna end up being another $100 I'll have to spend if I decide to go digital with the games I already bought.
But it's whatever! I'm not worried about it. I'm still on the fence until I hear more, so I'll just wait and see what else we hear about it. My PS3 will be a part of my collection for a long time before I retire it, whether I get a PS4 or not.
Edit:
V For fuck's sake. Do they want people's money or not? "It would overstretch the abilites of the PS4's processor." My ass. They know they can make it happen, but then they wouldn't make any money off people re-buying old games.