A flashdrive from a recent Cantina Tour event for Star Wars: The Old Republic contains some very interesting in-game screens of the MMO. Among them are player characters riding Tauntaun mounts.
There are also several shots of what appear to be new PvP arenas in the works. Tauntaun have been a long sought after mount for The Old Republic, and are currently only available as pets.
This would be the first animal mount for the Star Wars MMO as all others are vehicle-based. The PvP arenas are based on Makeb, Tatooine and the other is a Space Garage.
The images from the San Diego Cantina Tour were posted by Dulfy. It's not clear whether this will arrive in update 2.3 or 2.4 - BioWare has teased that update 2.4 is rather big.