This announcement comes at the heels of the Yu-Gi-Oh! counterfeiting controversy revealed a few short weeks ago. Upper Deck has been caught printing hundreds of thousands of counterfeit Yu-Gi-Oh! cards and managed to settle with Konami. We're not sure if the two are related but it may have had an impact on their agreements. Who knows?
There is no information right now as to which company will partner with Blizzard in regards to the WoW: TCG. I tried out the game myself at BlizzCon 2009, but I had recently gone back into Magic: the Gathering, and there is no way I can afford to get into another hobby at the moment.