Drop to all fours to run as fast as a wild animal.
Running Wild is a worgenracial ability, treated by the game as a mount but the only race eligible of learning it are the worgen. This ability, only usable outdoors, causes the worgen to stretch onto all four legs, increasing movement speed by 60% at level 20-39, and by 100% faster at 40+.
Running Wild is indeed the new racial "mount" for worgen. Functionally the ability works exactly like a mount. This does mean the worgen are not bringing faction mounts to the table which other Alliance races can access. This is also of course very different from the original Plainsrunning implemented for taurens. We have no plans to try and bring that ability back in any form.
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. :)
Despite Zarhym specifically stating that it is somewhat different, Running Wild is essentially the same concept as Plainsrunning, the original Tauren "mount" ability before the addition of kodo beast mounts. The only real difference lies in the mechanics; rather than trying to design a new type of movement to compete with mounts, Running Wild is mechanically identical to a ground mount, and simply uses a special animation rather than a mount graphic.
Worgen may still use other mounts, obviously.
The ability is automatically learned at level 20 in addition to Apprentice riding, this saves Worgen players some money as they do not have to spend 4 to learn Apprentice Riding and buy a mount.