The dragon riding isn't what I'm particularly interested in, especially because they'd have to blow up Skyrim to the size of Kansas for it to be at all practical.
Which, come to think of it, wouldn't be all that bad. If they could only fit all that crap onto one disc. And maybe the Throat of the World would actually have 7,000 steps instead of ~732.
Anyway, what I am interested in are the new armor types they brought up. And exploring Solstheim.