The smallish expansion, Hearthfire, that allows for some added crafting and the ability to build and decorate a house - is now available on Steam (£3.49). However, a possible PS3 release still seems miles off.
Bethesda's Pete Hines took to Twitter to explain that there is no news regarding PS3 DLC:
"I don't have any info on Hearthfire, Dawnguard, or DLC in general for PS3. We're still on it. Will share update when I have one."