"Some fun new pets added to fill in the family gaps. 3 humanoid, 3 dragonkin, 2 magic and 3 mechanical. Should be catchable in the next push!" - MumperWamo of Warcraftpets found some of these pets in the Pet Journal on the PTR, and you can check them out here.
PTR Updates to Battle-Stones and Pet Battles:
"A new item has been introduced that can be used to upgrade the quality of Battle Pets: Battle-stones. Pets over level 15 upgraded in this way can lose up to two levels in the process."
"The Dragon Kite can now be used in Pet Battles."
"Player versus Player Pet Battles now award more experience."