It's Over says Gilmour

" Shortly afterwards in a Billboard interview, he responded with "Who knows? I have no plans at all to do that. My plans are to do my concerts and put my [solo] record out," although he is very clear that his future concerns revolve around raising his children.[5] The tone of the answer suggests that, like Mason, he hasn't ruled out the possibility of appearances similar to Live 8."

With Mason it's not like he just hasn't ruled it out, but I remember him saying he'd tour again at a moments notice, he says if he got the call he'd start packing immediately.

I predict we're going to see something else out of the full Floyd soon, with Roger doing Dark Side this summer, and Dave getting back out on the road and back in the swing of things with his tour, and Nick is going to play with Roger on his tour and Rick is going to play with Dave... this is definately a lot of Floyd activity, they won't be able to help but getting back together for something -- probably not a tour, but at least another charity concert I think.

anyway, just my speculative $ 0.02.