Thanks for the info. I also just saw the twitter post about this. I think I'll wait for the (EDIT: DRM-free) kindle version (thanks to the Chrome web interface) or one of the other vendors. I've had enough annoyance with previous times I've put iTunes on a computer that waiting seems the better option.
I really appreciate how open Brandon is on these things (Warbreaker, DRM free ebooks, etc). TOR giving away a DRM-free ebook of Mistborn was what got me started reading (and buying) his books