Today, Bethesda announced that the next DLC for Skyrim; Dragonborn will be coming to PC early 2013. The Playstation 3 version will be released in the same time, though any exact date is not yet announced. Though it is likely it will be released in January.
As for the Xbox 360 version, it is coming out tomorrow, so the 360 players can enjoy the game a while before the rest of us get our hands on it.
We’re less than 24 hours away from unleashing Skyrim’s next add-on
Dragonborn on Xbox LIVE. It’s one of our most ambitious add-ons
ever and we’re excited for everyone to play it.
We’re also happy to announce Dragonborn will be available on PS3 and
PC early next year.
The support from Skyrim fans over the last year has been amazing, and
it’s driven us to support Skyrim more than any game we’ve ever
released – including free content updates, modding tools like the
Creation Kit  and the Skyrim Workshop , and our add-ons,
Dawnguard and Hearthfire.
And we're still not done – we look forward to sharing more Skyrim
news next year!