I still think Vrykul as an Alliance race could make sense (Humans in WoW supposedly descended from them, after all). Either way, I'd be all for it because I think a Vrykul Warrior would be so badass.
But yeah, as someone else said...I think if Blizzard wanted to make Vrykul playable, they would've done it in Wrath. Since it didn't happen there, I don't think it will ever happen.