Of course -- in the comments on the tor.com article: "Worldwide distribution is a much harder problem. Most of our contracts with authors grant us rights only in certain territories; we can't just unilaterally rewrite existing agreements."

I'm really interested to see what they do with a Memory of Light (the final wheel of time book). Brandon Sanderson has been pushing for things like getting a free ebook when you purchase the hardcover, but when I saw him in melb a few weeks ago he was saying those kind of solutions where more for his own books. WoT was too big a deal for TOR to play around with.