BlizzCon last year was terrible. Nothing significant was announced, it was literally a prelude to Cataclysm's release. This time round they better have some good news and announcements to share. I'm convinced it certainly isn't going to be WoW's 4th expansion because there is still a long way to go in Cataclysm. Work on Titan started around 3 years ago, so there is a very slight chance of finally being revealed. But in my opinion Starcraft II expansion is certainly the likeliest title to get announced.
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