User blog comment:Jimeee/Bethesda tweets mysterious teaser picture.../@comment-1777491-20121104025948

I'm totally speculating here but, perhaps it's some kind of Snow Elf/Falmer who's been given the power of Hermaeus Mora and/or a Dragon Priest in order to use the resurrected dragons to take control of Skyrim. That would kinda help to justify dragon mounts - aerial combat against his own dragon minions and such.