On the possibility of a DLC based in Morrowind or Solstheim, I think that it's probably pretty unlikely. While the terrain is all technically there, if you go over the southern border, the same can be said for Cyrodiil (even White-Gold tower is there). All that terrain was probably rendered for the sake of giving people something to look at when peering over the mountains rather than to actually give them the ability to go there later. On top of that, I wouldn't really call it plausible for Bethesda to make such a lore-focused DLC as anything based around the Snow King.
Those we can thank the Full voiced dialogues for. Also welcome to Slaughterhouse-Five RPG Codex poptarts, nice first post although Skyrim is only decent 6/10 game at best. And it has no replayability thanks to we won't lock no portion of game for different builds aproach from Beth.
Thanks for the welcome, though I've actually been reading the 'Codex since 2005 and joined originally in 2006 as Kreidebein. It'd just been so long since I'd logged in that I brainfarted on the password.