The recent NPCS of High Elven Mages of the Silver Covenant and Dalaran and the Blood Elven Mages of the Sunreavers should indicate where we're going in Midnight.
I have no doubt that Midnight will involve both the Sunreavers and Silver Covenant.
I do hope High Elves take up a more active role in "Arcane Mage" affairs and Blood Elves take up a bigger role in "Fel Magic/Warlock" affairs - especially if we're saying goodbye to the Sunwell.