Petz Rock!!!

Is there anywhere I can find a detailed explanation of how these pets work? And also, any idea when more pets will be added? I want to get a Petz that's out of the ordinary, i.e. not a common household pet :cheerful:
 
Oh wait, in the rules, it says that there is money hidden in some forum threads - so maybe you just get it w/no notification. Maybe we're just lucky?!