In its previous two seasons , the Intel Extreme Masters (from the Electronic Sports League) focused on two main eSports disciplines --- Counter-Strike 1.6 and Warcraft 3. Now, however, that's changing. They've announced that World of Warcraft will take over the spot from Warcraft 3, based in part on the success of previous WoW tournaments. While ESL doesn't explicitly say it's an Arena tournament, I think we can safely assume that to be the case.
This is just part of the ongoing eSport effort, and I think we'll hear about a lot more tournaments in the coming months. I don't know if Blizzard meant to bump its own game from some rosters, but I suppose there's only so much room at each tournament. There's also $750,000 (US) in prize money for the victors. They've not announced how much will specifically go to World of Warcraft, but it'll definitely make it worth winning.
[Via Arena Junkies]