Oh, also, it leads into Dragonblight, which features a quest chain that lets you fight with Sylvanas.

Alas, Shaharrazad would never fight with her Dark Lady, and I really haven't time to level any of my Alliance alts that high. Is there not a quest chain that allows you to fight for Sylvanas? Or...wait...is that what you meant to start with? I'm feeling painfully dense today.