The fact that they have to be cryptic and can't say "PS3 is getting Dawnguard and Hearthfire" or anything like that makes me think this is just going to be some lame consolation prize than any actual DLC of substance. A little thing to fulfill their obligation but nothing more. Probably Frankensteined out of various pieces of DLC (spears, crossbows, green robes, etc.) into one amorphous blob so they can say they released DLC on the PS3.
The only thing that makes me think that might not be the case is the PR nightmare and public/media backlash that could arise from it, but they didn't exactly care about that when it came to this whole issue with the PS3 and DLC to begin with so I'm not holding my breath.
Would love to be proven wrong though.