DailyTech are reporting Blizzard has made a big deal with AMD for 1500 Opteron powered servers. These are apparently for World of Warcraft world and instance servers. That's a serious amount of server power for whatever they are used for.

I am guessing Blizzard will combine the power of these servers to improve the gaming experience for World of Warcraft users worldwide – as well Blizzard may also be preparing for their next major online game. Perhaps they are preparing for the next generation Diablo or something of the like.