I doubt we'll see Mads Mikkelsen in the show because of his commitments to Hannibal.
I think this is my comment in this thread, but reasons for that is because I'm a latecomer to the show (this is a thing I do, I only just started giving Breaking Bad a watch, and I only first watched Mad Men a couple of months before Season Six started). I finally watched the first two seasons back in September but can't watch the third due to promising the fiancée that we'd watch the third together. Just finished reading the first book and look to catch up on that front.
Wish I could join in the discussions of what's to come, but alas I'm still a season behind and still have two more books to be up to speed. But that being said, I am aware of events (thanks to tumblr) like the Red Wedding, but there's a lot that goes on. That being said, I am looking forward to Season Four, hopefully, by the time it airs I'll be in a better position to comment on things.