Just by judging the Azure Span alone that one is definitely a few smaller zones worth since it has the Grizzly Hills zone, the Borean Tundra zone, and then the actual snowy and icy mountains of presumably another entire zone, all combined into one.
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Specifically what the allied race leak refers to that isn't someone's guess, is just that there was a leak before Dragonflight was announced that got a bunch of things right and anything it didn't get right isn't actually contradicted, it just hasn't been said yet (presumably). That leak said that there would be an allied race added in prepatch or as part of the pre-order, I forget which.
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When did this happen? Last I heard it used vulpera animations and that was literally all we actually knew. Did something change or are you just assuming?