Yeah, that's a very good question! Songs such as The Mundane And The Magic, UnDo Control or Insanity's Crescendo. I guess it would be really cool
I already know that there are clean vocals on the last track, Iridium, so I'm really curious about that one as well. You know, all this talk makes the wait a lot more difficult
EDIT: A comment from someone who heard the song already:
"Surely one of Dark Tranquillity's new masterpiece! Everything is just perfect there, the clean voice, wonderful as it never been, the screams and the ambiance are just mindblowing! It could be the best closer song to a DT album!"