I can say that I won't be using the setting in 4e and I've never liked the official settings. the elements I pour into my homegrowns are siphoned from other capaign settings.
A new campaign setting is a fairly scary proposition at this point. I've been talking with Ari about working on Violet Dawn. Our conclusion is that the game will be pretty new to a lot of people, so everyone isn't going to want to jump on a new campaign right away. I would consider anything that's cool, but I'd have to see it first. If the new D&D is as different as I think, I'll probably be happy with the core setting for awhile.