Aug 22nd 2009 6:52PM I'm under the impression that Icecrown is roughly 3-4 months away.. putting it somewhere between Thanksgiving and Christmas.
Another 4-6 months later is when I believe Cata will drop, putting it roughly around Easter of '10, maybe a bit after. There's no possible way they're waiting until NEXT Christmas to drop the expansion, especially with just one more major patch left in Wrath.
My belief? Cara's out no later than 4th of July of '10.