- May 15 = Fetish Shaman from Diablo 3 CEAfter June and July, there might be a small gap for pets (other than the companions available from in-game holidays). I haven't found any news or hints that the upcoming seasonal events will have any new pets to offer, but we'll see.
- (Some time after) June 5 = Murkimus from Arena Pass
- June 12 = Sand Scarab from TCG deck, Tomb of the Forgotten
Things that are still unknown: the MoP release date and the Timewalkers: War of the Ancients TCG deck release date. The MoP CE will likely have a special companion attached to it (just not sure what pet), and the common loot card for the Timewalkers TCG deck will be the Eye of the Legion.
I'm looking forward to all of it. :D