Report: Next Skyrim DLC is Dragonborn, Set in Solstheim
According to Bethesda forum member Mardoxx, who did a little bit of digging in Skyrim's 1.8 patch source code, Bethesda may have another Skyrim DLC, dubbed "Dragonborn" in the works.
His post on the official Bethesda forums points out the following evidence:
"data\interface\Translate_english.txt
$Crafting_$DLC2ArmorBonemold BONEMOLD
$Crafting_$DLC2ArmorChitin CHITIN
$Crafting_$DLC2ArmorNordic NORDIC
$Crafting_$DLC2ArmorStalhrim STALHRIM
$Dragonborn Quests Completed Dragonborn Quests Completed
$DRAGONBORN_ESMName Dragonborn
$DOWNLOADABLE CONTENT_PS3 DOWNLOADABLE CONTENT
update.bsa\interface\exported\hudmenu.gfx & quest_journal.gfx
Hudmenu compass markers/quest journal quest header:
http://i.imgur.com/mWGUj.png
Clockwise from top, Telvanni Tower, To Solstheim, Raven Rock, Castle Karstaag, Standing Stones, To Skyrim, Miraak Temple.
Bottom is quest header for Dragonborn quests
update.bsa\interface\startmenu.swf\startmenu.as:
MainList.entryList.push({text: "$DOWNLOADABLE CONTENT" + (iPlatform == 3 ? "_PS3" : ""), index: StartMenu.DLC_INDEX, disabled: false});
Update.bsa\meshes\animationsetdatasinglefile.txt
DragonMountedDualMagic.txt
DragonMountedDualStaff.txt
DragonMountedMLhSolo.txt
DragonMountedMLhStaff.txt
DragonMountedMRhSolo.txt
DragonMountedMRhSolo_ShieldOrTorch.txt
DragonMountedMRhStaff.txt
There are other things like new creatures and dwemer objects, but they're not that interesting."
Though Mardoxx's forum topic was locked, others have been started to carry on the speculation. So far, it's been uncovered that Dragonborn may feature spears, new armor types, and the one thing we've all been yearning for out of Skyrim: dragon riding.
Solstheim was the setting for Bloodmoon, Morrowind's werewolf expansion. However, considering there are already werewolves with the Companions faction in Skyrim, it's highly unlikely that the conflict that'll be present in Solstheim will revolve around werewolves. But who knows? Maybe this will be the werewolf DLC that parallels the vampires in Dawnguard.

La la la so happy now
Hope it's not an XBox exclusive for 30 days, but even if it is doesn't matter.
I hate the simplified stat system
story was good
but that's about it..
Keep in mind that it's still unconfirmed.
- Catherine Cai
*SPOILER* Well, you technically DO kill the Emperor...
I wanted to play this game so badly, but i decided to wait untill its 100% ready for my high expectations.
Im looking forward to my new skyrim with 30+GB size (my oblivion is currently at 18GB :F).
Oh, I suspected they were going to make a Sostheim DLC as soon as I first saw the in-game map of Skyrim and didn't see Solstheim.
the ps3 version of the game is so broken that they need to devote time to recode the hell out of it instead of putting dlc on top of it.