[devonin]

But if you paid attention to the quests and all the new lore, it's not hard to see 2-3 new expansion ideas.

Expansion idea 1: Archdruid Staghelm and the corruption of the Emerald Dream
Expansion idea 2: Neptulon makes the Maelstrom start actually pulling the continents in
Expansion idea 3: More other-dimensional people like the Eredar turn up
Expansion idea 4: With Arthas dead, Kil'Jaeden launches another invasion in revenge
Expansion idea 5: Sargeras takes a more active role in trying to destroy the world
Expansion idea 6: Sargeras manages to corrupt Velen, hilarity ensues

I could go on.