Considering Blizzard did not and will not release a new product in 2011, it seems like this year's BlizzCon could be an especially interesting one. Blizzard has used its annual convention in the past to announce everything from Diablo III classes to World of Warcraft expansions. With the second iteration of StarCraft II on the horizon, Diablo III's release a few months away, and World of Warcraft's official subscriber numbers in a state of decline, Blizzard has a lot to talk about...