Another piece of good news I have read about the PS4 after the conference is that it will still accept used games.
The only bad thing I have heard following that is that since PS1/PS2/PS3 disc based games won't be backwards compatible that PSN purchases will also not be compatible.
http://www.joystiq.com/2013/02/21/psn-transfers-ps4/
Hopefully with Gaikai they will find a way to allow you to stream these games without repurchasing them. Otherwise I may just have to keep my PS3.
Gaikai did make the promise that eventually all PS1, PS2, and PS3 games will be streaming and I think it's a very interesting that all those games will be playable from any device like a tablet or a phone bringing those games to everyone, even if its not a Sony device.
