User blog comment:Jimeee/Dragonborn officially released on Xbox Live/@comment-402843-20121229005806/@comment-3152761-20121229071243

I've heard they are making atleast one more and a couple places have mentioned two more. It depends on who you believe though, one more DLC is very likely. Two is probably 50/50 chance though because of the success of the game but who knows...Fallout 3 had 5 moderately sized DLC's and that game was less sucessful than Skyrim.