I think all the ps4 really needs is just a lower price and improved graphics from what the ps3 had.

The only thing I think that would be cool for the ps4 to have that the ps3 doesn't have is the ability to install the entire game onto your hard drive so you don't have to bother with putting the cd's in everytime you play.

If they did that couldn't they make it so once the game is installed the first time the only ps4 it could be reinstalled onto is the original ps4 it was installed on (so people who didn't buy the game couldn't borrow it and install it on their own gaming system?