Also, Pete Hines tweedted this recently on his Twitter Feed.
"For those asking, yes, today's thanks/farewell Skyrim post does mean there is no more DLC coming. http://t.co/lWXMuP4Ex5"
There may yet still be hope. I for one am disappointed that we really did not receive another DLC. Dragonborn did not leave a good taste.
Edit: It appears my title is numbered incorrectly. It should say "6".
Double Edit: Oh my, how embarrassing. I am absolutely mortified that I have misread HInes's post. There will be no more DLC.