This week is Children's week .. where you get to shamelessly exploit orphans for personal gain. This year there are no additional pets (although there are quite a few to get, so make sure, if you're a collector, that you aren't missing any!) but there is a new toy.
Check out the Wowhead guide for more information on the various pets, achievements and quests.
Exploit children? We deserve a reward for putting up with that annoying Orc brat's demands