Bendak over at Eyes of the Beast
has been doing excellent work over the course of the beta, and one of the things he's discovered is a big expansion to an existing pet family and the creation of an entirely new
family - the rhino family has been renamed the clefthooves family (you can see Bendak above with one he tamed) and it now includes all the Outland and Draenor clefthooves in addition to rhinos from Azeroth, and there's a new family called the Stag family, which includes all Azerothian stags and the Talbuks from Outland and Draenor.
The Draenor talbuks aren't currently tameable, but they're slated to be.
I know quite a few hunters who've wanted stags for quite some time. This should make them very happy, and I've always thought it was weird we could tame rhinos but not clefthooves.