there needs to be another point be made there is a high possibility that the dlc will not even be playable on ps3 if you have played the Fallout 3 dlc's you will know they lagged and froze like crazy now before 1.4 skyrim lagged and froze like crazy and it still does I'm predicting that dawnguard will be a mess ps3 heck the Pitt was so bad they had to take it down from psn for a week or so
I've read a articles on websites from editors,critics and even a few developers where they in a kind manner chew Sony a new one for making the PS3 so difficult to develop for.