In honor of the massive Cataclysm info dump, this edition of the Queue is in honor of our soon-to-be overlord, Deathwing the Adorable.
"Do you think we'll ever see Arthas' older sister Caila in WoW? Heir to the Lordaeron throne AND we know she had a bit of a thing with DP/Deathwing... so... possible introduction in Cataclysm?"
Possible, sure. I mean, look at Deathwing up there, how could she resist coming out of hiding to give him a snuggle?
Seriously, though, while it's certainly possible I have no idea. Commenter Tabardsrock linked to a speculation post on WoWWiki about a possible in game presence for Calia Menethil, which I find interesting and wouldn't mind seeing expanded upon. The problem with Calia Menethil at present is, even if she did return and assert her claim to the throne of Lordaeron, there's currently a small problem with (SPOILERS SPOILERS SPOILERS) walking, genocidal undead infesting the place. However, it could be interesting to see her pop up, not only to bedevil her old "fiancee" but also to give Sylvanas the business. Frankly, minus a foil, Sylvanas is starting to wig out.