According to wowpedia, it says Lor'themar plans will be revealed. These are my possible ideas on what will happen. But am curious if you have a different set, or just post your beliefs on what will happen. And all I ask is to keep it civil. Yes I am a major Blood Elf player, have loved the High/Blood Elves since Warcraft 2 when most of my army would be Elven Destroyers and Archers/Rangers.
That said my main idea what will happen is:
1) Lor'themar Theron will make the first move on "dethroning" Garrosh. Something will happen in which Garrosh "pushes him over the edge." He will cry for a Mak'gora, and will most likely lose (either by dying most likely, or severly injured). The city of Silvermoon will revitalize the Convocation of Silvermoon with Lady Liadrin, Halduron Brightwing, Auric Sunchaser, Grand Magister Rommath, and Aethas Sunweaver and others leading them. Even tho they are now under the heavy eye of Garrosh Hellscream now, they would like nothing better then to dethrone Garrosh for all the things he's done to their race.
2) Lor'themar Theron with the Blood Knights, Sunweavers, Farstriders, and Magisters, will march on Dalaran to remove Jaina Proudmoore and the genocidal high elf Vereesa Windrunner from power. They do kill Vereesa, but decide to leave Dalaran after seeing that they are no better then what her Silver Covenant did to their people.
3) They decide to part ways with the Horde, seeing that they dont need them anymore after the revitalization of the Sunwell.
I had a fourth, but as I typed this up, I forgot what it was.