wtf are you talking about. Blizzcon 2015 was 2 months after the Legion reveal at Gamescom 2015. And Convention centers aren't booked constantly: They're usually empty 3 weeks out of every month. That's why Blizzard usually always gets a november date: because they choose it, not because its "all they could get"
You're making a bad assumption that they're somehow "reluctant" to announce stuff at Blizzcon. As seen with Gamescom, they don't even need to reveal a game there.

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