Besides better graphics and bigger and better worlds, what do you think will happen this next gen for the Xbox and PlayStation brands?
Personally, I expect them to be completely compatible with last generation. All your games will carry over, even digital ones. Developers can still make a 360 or PS3 game and still be safe knowing people can play it both on current and next gen systems.
I also want, if half-expect, the ability to record game footage and be able to upload it to YouTube. Some games should also be upgradable, like Minecraft on 360 having an optional 720 update to allow it for a full Minecraft experience.