Will they have to cast "Running Wild" or will it be instant?
If it not instant, think how silly it will look, having to cast to get down in "doggystyle".(If thats how they are gonna run)
If its instant, think how it is to be a worgen druid.. Instant ground mount and instant flying mount..
It was already stated it works like a mount without the mount.
So you have to cast for 1.5 seconds to use it.
Either way it'll probably look dumb as hell for casters because you cant run on all four in a dress, derp.
Instant will be a little silly balance wise, although it would look better. But i imagine it'll have a cast time and some sorta Normal to mount speed animation while you cast (like a runner getting down a prepping for a sprint).