Speeking of that house in raven rock, I decided to get some sleep at my new house there after a day of exploring and woke up in a freaky way, I'm not gonna spoil anything but yeah..was not expecting that. I haven't done the main quest of the dlc yet so i guess what happend only happens before doing that.
I also went back to Skyrim after returning to Raven Rock after that "event" and slayed a dragon ouside my manor, and when I did:
I heard Miraak's voice telling me I was weak and crap and then the MOFO STOLE MY DRAGON SOUL!!!
Don't know if that happens with people who run straight thru the main quest either. But have to say, these little unexpected twists have made it very enjoyable! Glad I didn't just go straight thru the main quest.