You have to pay for it and you have to have either a Xbox 360 or a PC to be able to download the DLC. It's most likely vampire influenced in a way. Considering we have vampire animations, crossbows, immortal Snow Princes and coffin animations. There is even a coffin puzzle animation that makes me wonder if we are going to unearth a long dead vampire or something. Maybe for a vampire quest?
Yeah,I got almost all oblivion add ons

But i did not get Horse armor,Since i never had a horse,they were so clumsy in oblivion. And hmm. That sounds epic, And i am wondering those flying vampire lords we have seen in gamejam,is it those we are talking about? do they really exist in lore?
And now it almost seems like snow prince vs great ancient vampire? if so,maybe you could choose wich to side with,well i have no idea what its going to be about.