I will also be going to 4E. I'm not sure how long that will take (it may be a year or so before my current campaign ends, after which I'll make the switch) but I will definitely do so.
I'm planning on going to 4e - almost everything they've revealed sounds good to me!
Of course, just because they have the right intent doesn't mean their implementation will succeed, and I'm getting a bit worried about how much of it still seems to be in flux.
I will be changing to 4e and will try to get a new group together later that summer. But I will still keep my 3.5e stuff, just like I kept all my old stuff too.