So far its true that Deb wont be doing the whole love thing since Hanna will take that place. I was intrigued why Dexter even fumbled over a mouth swab which he does countless times with the dead or alive. An interesting point was made that at one point of the scene, it kind of relates to how Dexter met Rita (I cant be fucked going back that far to check lol so tell me otherwise). Dexter pricked his finger the same way he broke a glass seeing Rita. There's also a faint resemblance of Rita in Hanna. Watch this video of Yvonne explaining her character addition to Dexter. People may cry Hanna to be the next Lumin but I think she's a tad different, being more attracted to bad guys lol
http://www.youtube.com/watch?v=bP_lFmQ3F4I
The whole Louis shit, (my speculation) was probably something the writers just had in case the whole mob vs Dexter doesn't pan out (end of my speculation). Another interesting point is the fact Louis had the last laugh leading the mob to Dexter and dying on it, which can lead to a lot of mess for Dexter to sort out. I'm glad he's gone.
I'm very interested how Dexter will deal with the mob. Will Dexter get tortured? How will he escape?
What's funny is that everyone forgets that another black cop dies again and he's buried with all these new factors coming in. Poor guy, he was short lived. I thought he was going to be the next Doakes and go SURPRISE MOTHERFUCKER! like old times haha