Look what I just found!
Info was found at
World of Raids. Here's to hoping that its a new engineering mount. That would make my week. As long as I can make one without the side car. I hate side cars on motorcycles.
EDIT: Also, a video of it in action on a private server (so its going faster than it should be, and its only the model, not a character riding it) can be found
here. This makes me very happy.
EDIT2: Link to really big picture version
here.