This ALL started thanks to MrGM; I love the guy but he's created one hell of a storm of spam on every known site that is related or talks about World of Warcraft. If people don't know who MrGM is, or what video I'm referring to... see below.
https://www.youtube.com/watch?v=1YDHoN5hGEA
All thanks to this single video, we have non-stop spam of people asking the same question and the REAL answer is WE DON'T KNOW. If we follow previous expansions this wouldn't be the case.
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The Burning Crusade
Blood Elves and Draenei were playable at release
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Wraith of the Lich King
Death Knights were playable at release
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Cataclysm
Worgen and Goblins were playable at release
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Mists of Pandaria
Pandarians were playable at release
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Warlords of Draenor (The Expansion Who Must Not be Named)
Nothing significant as a race or heroic class
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Legion
Demon Hunters were playable two to three weeks prior to the release of Legion and you could only play in the starting area
Legion is the ONLY expansion to change this formula and it was a few weeks before the actual release. To THINK that they'd release FOUR of the SIX new Allied Races to play BEFORE the Expansions release is FOOLISH to think, they'd be releasing a LARGE selling point to the expansion early for NO REASON what so ever. If they were going to do this, like Legion, then LIKE LEGION they'd release them a few weeks before the actual expansion and the expansion for Battle for Azeroth IS MONTHS AWAY.
Please STOP asking.