"You can never say never to anything like that," he admitted, "but it's not what our focus is. This type of game is where our hearts are, what we get excited about, and that's what we want to focus on. We don't want to lose that focus and we never want to sacrifice anything in the singleplayer game just to have it be multiplayer."
http://www.joystiq.com/2011/12/11/skyrim-to-have-multiple-dlc-releases-powerful-buckets/
This is to people who are afraid the MMO will kill the main Elder Scrolls games.