The identity of the free pet that Worldwide Invitational Paris attendees received with a code in their goodie bag has been a closely guarded secret, with the identity not known even at the WWI itself. Yesterday, Bornakk broke the silence on the pet and announced that after patch 2.4.3 goes live, WWI attendees will be able to turn in their pet codes for their own miniature version of Diablo's Archangel Tyrael!
Tyrael, as you may remember, is an angel that assists the Horadrim -- and later the heroes of Diablo 2 -- in fighting back the Prime Evils as they attempt to assault and take over the world of Sanctuary. He is one of the few angels who will directly assist humanity in fighting Hell, even when he is specifically forbidden from interfering by Heaven itself. He eventually destroys the Worldstone after Baal corrupts it at the end of the Lord of Destruction expansion.