I think the nextbox and PS4 will just be much better versions of the consoles we have now, I can't see anything revolutionary happening next gen, and I'm happy about that. I love the way our consoles are now, so giving me bigger, better looking awesome games and perfecting existing services/software while adding new ones is exactly what I want.
It's hard to be excited about something that doesn't yet exist, so I'm excited for the potential of the PS4/720. Not really bothered about the WII U or 3DS. Not too sure about the Vita.