Fresh new leak coming in.
Alliance will be getting Blood Elves in 12.0, but it involves a storyline where the High Elves let go of their High Elf titles, iconography and rejoin the Blood Elves.
Vereesa Windrunner ends up dying so Alleria Windrunner can become the second Ranger General for the Blood Elves as a diplomat to the Alliance.

Source? The elements told me