I’m hoping to see a renewal in their development. A new capital in a revamped Hyjal will do wonders, and is the capital they should have had in the first place. The Kal’dorei are still in an odd position story-wise, and I hope they’re given a direction that’s centered around their continued conflict against the Orcs on the border. As a starter zone, there’d be plenty in Mt. Hyjal for Blizz to work with.
They’ll likely continue their worship of the Moon Goddess, but I can’t think of much else they could do with that.