They will definitely reveal the next wave of Allied races, if not literally everything that remains.
They'll hint where 8.2 and possibly further are leading. They'll talk about major changes to Azerite system that are much needed. Beyond that we'll see, I guess. Obviously 8.1 will be fully revealed along side of all Kul Tiran/Zandalari info.
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Way too early for that, and Azshara will be killed off this expansion almost certainly. N'zoth will likely be the big bad here as well, but that remains to be seen. Him being a part of the next expansion is vaguely possible.
Ogres will not be an allied race (too much work required, unique animations etc), nor will high elves or anything else elven be added (should be obvious, the only people who believe this are the ones obsessed with playable high elves). Just stop while you're ahead, lol. Vulpera will be Horde but that has been a given for months now.