You were so spot on dude! Going back reading this, the 10.0 was wrong yeah, but the raids...you called it. NiceMy speculation:
9.1: Raid that takes place in the realm where the machine of Death is located. Kel'Thuzad will be defeated in that raid, and the machine of Death will be fixed.
9.2: Raid that takes place in the revamped Maw (akin to revamped Tanaan Jungle and Broken Shore), as all the covenants take the fight to the weakened forces of the Jailer (who no longer has a constant influx of souls). Sylvanas is the final boss, she gives her sob monologue, then the Jailer backstabs the crazy psycho and she's gone.
9.3: Raid that takes place in the mysterious Sepulcher mentioned by the Primus, somehow the Jailer finds a way into that realm. The Arbiter will re-awaken and take us there, the final boss is obviously the Jailer. At the end the Jailer is destroyed/sealed again and the rift between Azeroth and the Shadowlands is fixed.
A small raid, either in patch 9.1.5 or 9.2.5, will involve the Light/Void messing with the Shadowlands and build-up 10.0.
10.0: It will be an expansion about Light and Void, as Blizzard already said at last Blizzcon that they find this concept very interesting. Alleria, Turalyon, Calia, and Yrel will obviously be main characters of this expansion. I am also 99.9% sure that Alleria will be the poster girl of this expansion, simply because Windrunner girls sell videogames (the 0.1% has Calia or Yrel as poster girls instead). That's as far as my main theorycrafting for 10.0 goes.