I'd rather not face another bait and switch expansion so it'd be nice to know in advance where we're going with 100% certainty. Other MMO's announce where upcoming expansions are going to be set. I can understand not wanting to reveal specific story details but I'm not a fan of the habit of trying to avoid any and all spoilers at any cost. We're spending money to buy the expansion - usually in advance - which is a good enough reason to give us more than a very vague premise of what to expect.

I'm hoping that, at the very least, it's set on the Source. If it's another world hopping expansion so soon after the last...then I'll be rather disappointed.