There are currently rumors out there that U2 have the claw rented until 2015. That's enough time to encapsulate another album/tour cycle. Conceptually, they're not going to find a way to top 360 tour until they come up with a cheaper way to do 360 stadium shows. They could find ways to reconfigure the stage and make an entirely new show out of it, and decorate the claw differently, but I think the actual concept of the claw is going to stay. Just like how the band used the same staging for UF, JT, LT, Zoo (arena), Elevation and Vertigo tours (it's true. The core part of the stage, aka the part the band stood on, was the same stage, dressed up differently each time. I read that in some book written by U2's touring staff.)
Hopefully the next tour with the claw is called something a little better than 360 tour.
One would think they would use a different stage next time...and drop arenas for a while.
Didn't they say they would leave each of the three Claws in a different place of the world to serve as a permanent structure for events/music shows etc.. after 360 ends ?