The Deep Boars from the concept art? Honestly, I was never sure why the hell that was supposed to be a worgen-appropriate mount anyway. I mean, these Gilneans are all standing around, riding horses when they mount up to go run their dailies or whatever, and the. . . suddenly. . . they get turned into worgen, the earth splits open, and vicious, slobbering BOARS FROM HELL spew out of a crack in the ground. So, Greymane and friends are standing around, seeing this, and they say, "Hey, we have all these horses, but now that we turn into puppy-men all the time, we should be riding THOSE THINGS!!!" Ummmm. . . ok. . . why?

Really, I think that's why Blizz ended up going with Running Wild as the Worgen "mount," so Worgen players would have something unique to get them around, since. . . wait for it. . . the traditional Gilnean mount WAS A HORSE! :-p

Lighten up, people! :-) In any case, when the worgen saw the Deep Boars Blizz had ready for them, they probably ended up thinking "All-Bacon Lunch!" instead of "Mount," so Blizz had to come up with Plan B.