PS4 Has just been unveiled.

Well, games are virtually the same for any console. They were just showing off some of the advanced graphics that it will support. At least the very early early stages of "advanced" graphics.

A lot has changed with just the PS3 since it's release until now. The same will happen with the PS4. It will start off with just a little better than current gen, and then it'll be much better.

For example, Genji was a (US) release title for the PS3.

It's pretty, but it's not game changing.