Blizzard revealed a new feature coming in the next WoW expansion, Pet Battles
! Check out their official Mists of Pandaria Pet Battle System page for more information.
Remember that there are still a lot of unanswered questions about how Pet Battles will function, and Blizzard might change how it works before the next expansion is released. Until more information is confirmed and released on the subject, we can only speculate on the details. Let's keep it fun and friendly!