Originally Posted by
Schizoide
Beyond another continent or nagatown, there's also the moon, the underground, the elemental planes (we've only really been to Deepholm, and that was a cool zone), and other prime planes (Outland/Draenor was one of those).
That "leaked" expansion list from several years back implied that our next expansion would be to prime planes that the Burning Legion attacked; K'aresh, Argus, Mac'Aree, Xorroth, etc. That would be pretty cool. I'd love to see an expansion with players teaming up with the Ethereals to protect, arm, and train rebel "freedom fighter" forces on all those worlds overrun by the Burning Legion. Finally to go on the offensive against the burning legion, rather than being in defensive mode all the time.
The Wrathion storyline does strongly imply that the next expansion will be burning legion-centric. We haven't seen anything out of them for two entire expansions, after all, and they are a prime antagonist in Warcraft.