A Community manager was good enough to confirm that "Like the Elder Scrollls Construction Set for Morrowind and Oblivion, we plan to release Creation Kit so you guys can mod Skyrim." It was pretty much a given that Bethesda would support modders in their Elder Scrolls game like they have before, but it's always nice to have the official go ahead. We have no other details of when or how it will be released, but they will be there all the same.