You're trying to infer some behavior from blizzard when, really there's no real rules to this. The Shadowlands teaser was likely ready to be shown for months & in the other direction, they could reveal the next expansion the same day they open up the alpha for it. But your analysis of pervious expansions isn't even accurate: Revealing the next expansion after the last patch is announced but before that patch is released to live servers is actually the norm. They did that for Shadowlands, BFA, WoD & Mists.

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