also, these pets are bind on pick up rather than the traditional bind on battle.net account for extra special companions.
while i still think it would be awesome if these two new pets were offered as an anniversary gift from blizzard this year,
UPDATE: in case you missed it, thanks to kezzy in the comments below, there is a confirmed source for the two balloon pets. :D new (low level) faction specific quests, blown away, will award a faction balloon. and no, unfortunately, you can't do your opposing faction's quest. (i just tried haha) also, the balloons are in the same boat as the tuskarr kite and dragon kite; they will disappear when you mount up. sadness!