Since its release, Skyrim has received three pieces of downloadable content: Dawnguard, which allows you to play as a vampire or vampire hunter; Hearthfire, which adds house construction and child adoption; and Dragonborn, which expands upon the dragon-related lore of the series and enables dragon-riding.
PS3 players have yet to receive any of these packs, and PC players are still unable to purchase Dragonborn. All of that, however, will change next month.
February 5th will see the PC release of Dragonborn via Steam, in English, French, German, Italian and Spanish.
The PS3 dates are a little less certain, but Bethesda assures PS3 fans that all three packs will be released on PS3 in February: first Dragonborn, then Hearthfire, and finally Dawnguard, curiously the reverse of the original release order. Perhaps as an apology for the delay, each pack will be 50% off on PSN for a week after release.
Source: [Bethesda Blog]