I don't know how new this is but it's news to me, and great news to Mages looking for more Polymorphing fun -- reader Alassiel on Uldaman (thanks!) was
poking around Dalaran in the beta, and in the Sisters Sorcerous shop, he found a new Polymorph spell, Black Cat, for... wait for it... 2500g. Yes, it'll cost you more than twice a Gigantique bag, but if you're looking for a new Poly spell and don't want to muck around in the waters of ZG, there you go. And apparently Polymorph: Serpent is also occasionally sold by the same character for the same price.
Both spells seem to be level 60 spells, strangely enough (Update: Because, I learned in the comments, the highest rank of Polymorph is obtained at level 60), so if your 60 Mage has 5000g just sitting around or has a rich alt willing to pay the price, you could be using them then. WoWWiki also says the prices are rep-related, so if you do a little grinding for the Kirin Tor, you might be able to pick them up for cheaper. And don't forget that this is Wrath -- 2500g is likely only a few days of dailies anyway. Polymorph on!
Online Resources
All characters and teams on the tournament realms will be searchable and have full profiles on the Armory. The Armory will also
feature a ladder for the tournament realms, which will be updated daily. In addition, a special forum will be set up on the World of Warcraft website for Arena Tournament discussions. Only accounts that have been registered for the tournament will be able to post there; however, the forum will be open for viewing by anyone.