#1 - Oct. 22, 2011, 7:30 p.m.
http://media.mmo-champion.com/images/news/2011/october/art41.jpg
While this is obviously a wild mob, it is the only sufficiently large animal in the preview that can hold someone. And it seems to fit the Pandaren Tibetan aesthetic a lot, so my guess is, we'll see those bridled, sadled and ridden by a lot of people next expansion. Including their bovine relatives.
Yuk.