According to code pulled from the latest Skyrim patch, the game's next piece of DLC is thought to be called "Dragonborn." Eurogamer took note of Bethesda forum member "Mardoxx," who went code diving and came up with a few unconfirmed details. Dragonborn will take place on the island of Solstheim, include new armor types and there are references to dragon mounts and several locations.
Bethesda had no comment on the information when asked. The company did previously trademark Dragonborn, as it did with Hearthfire, which turned out to be Skyrim DLC.