I think if they'll have a Collector's Edition they are going to release it on the same day as the regular edition.
They just don't know if they want to release a CE at this time for whatever reason.

Oblivion was probably my favorite all-time game, but I still won't get the collector's addition for Skyrim. I was originally planning to, but I've realized that it really is a waste of money for me. I'm not a comic book nerd or anything so any models or figures that come with it won't do any good, and any in game exclusives just wouldn't be worth the extra 10-20$.