The Road to Mordor: LotRO's next four expansions

With under a month to go until Riders of Rohan hits the digital starting gate and gallops past the horse metaphor, expansions are weighing heavily upon my mind. I'm excited about horse combat and a break from traditional questing (to a point), but I'm also hoping that Lord of the Rings Online's fourth expansion will prove far more compelling than its previous one turned out to be.