Erm, they have lots of other things they can talk about. If they release WoD after blizz-con it is practically suicide for the game. They need to release it before and they can use the convention to talk about 6.1.
They can also talk about the WoW movie, Starcraft, Diablo, Heroes of the storm and any new projects.
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You do know how large blizzard is? They probably have an entire team dedicated to doing blizz-con.
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Blizz-con doesn't revolve around world of warcraft. Who cares if guilds are progressing. Its a game.
And please stop using ... when you don't need too.