Worgen will sprint on all fours instead of getting a physical mount.
Zarhym just confirmed on the official forums that Running Wild is the new racial "mount" for worgen. Zarhym says it best, so I'll let him do the talking:
"Ultimately, we feel Running Wild fits very well with the nature of the worgen race. Rather than getting a physical mount, they get down and sprint on all fours. When you're playing a worgen, it just feels awesome. :)"
So yeah, worgen are going to run really, really fast. Sounds like fun to me! Of course, this means other Alliance races won't have access to a worgen faction mount. What are your thoughts on running wild as a worgen?