The Goblin racial is definitely interesting.
I wouldn't bank on the Tauren Stun joining with Pally Stun to be anything game breaking yet. Blizz is downsizing the rogue stunlock so they could potentially put the Tauren Stun on a shared DR with Pally and Warrior stuns as well. It will however, be very nice vs high avoidance targets.
The Goblin Racial will have major implications in flag extraction in WSG (This will be it's biggest effect at 19s imo), and provide hordeside warriors and rogues an anti-kite mechanic at the expense of other racials. The Worgen Racial has its uses, but it can be trumped by snares and roots much more easily than the Goblin racial. Rogues will love it as an anti-kite mechanic with more time on target potential than does the goblin racial, and the hunters will love it as a kiting cooldown that doesn't get nixed by being hit.
Now, Worgen and Goblin mages are going to be very mobile forms of walking CC at 19, though Orc mages will have that extra oomph to go along with the int changes as well that could provide a very nice burst option for hordeside mages. I'm not certain how Gnomes int buff would measure against the Worgen 1% damage buff though as far as damage is concerned.