I just did the 11 Pandaren pet trainer battles leveling up an alt and found that the pet experience has been greatly increased. Maybe I missed seeing that somewhere, but this was new to me. With both pet treats and the safari hat, a level one pet went from level 1 to 19, and the 2nd battle it went from level 19 to 25. So that's 5 1/2 pets that you can level now in less than an hour. This should greatly help those people trying to catch up, especially with the increasing number of battle pets.