The first and most exciting thing revealed is that you can indeed ride Dragons as
we speculated about previously. The DLC apparently includes an achievement called DragonRider that is unlocked by taming and riding five dragons. What's still unclear though is whether you can ride dragons anywhere; the isle of Solstheim where the DLC takes place and you can buy a house has its own map separate from the rest of Skyrim, which may mean it's the only place you'll be able to take to the skies.