I don't genenrally know spoilers, nor do I like to spread them when I do know, but I have heard musings of Dan getting out of prison with "dramatic consequences". (hey, if I told the whole story, it would ruin the surprise!) but it will be interesting to see how he does get out. Even though it's been 4 years, that's still an awfully short time to be in prison for murder, even if you did turn yourself in... I can't imagine Dan getting released on "good behavior"... I can't even picture the words "Dan" & "good behavior" in the same sentence...
It will definitely be fun to see! but only a couple short weeks till we reach the end of our season 5, part 1...