Skyrim - DLC with dragon mounts, Solstheim?

This is firmly in rumour territory but this sort of technique has yielded accurate results in the past...Eurogamer reports a Bethsoft forum member has delved into the code from the last Skyrim patch and found:

It's unconfirmed, but it looks like the next Skyrim DLC will be called Dragonborn and take place on the independent island of Solstheim (East of Skyrim, North of Morrowind).

There may be dragon mounts (or it could be a scripted ride), new armour types - Bonemold, Chitin, Nordic and Stalhrim - and mounted spell casting may be on the way.

Locations Raven Rock, Miraak Temple, Castle Karstaag and Telvanni Tower were also mentioned. As was PS3 downloadable content.

Thanks, jhwisner!