I don't thinks so. The reason why you don't see "CentOS" StackExchange but an Ubuntu one is because most people using CentOS or other flavors have already forged through the basics. They're using it as server setups and typically will have questions regarding specific software setups or error messages.
Ubuntu is more unique in that is takes an approach to Linux Desktop that other flavors really haven't hit on yet: Linux for everyone. which will receive a host more of questions from people actually using Ubuntu that will likely be Ubuntu setup specific and not specific to Linux.
I've committed myself to that proposal also - and look forward to the beta.