I think Edvinsson will stay with the club. Possibly also Soderblom.
Edvinsson wil get 13-14 minutes a game, and that's really fine, and he'll move up the line up as Maata and Chiarot needs rest or get injured. He'll probably see some PK2 time as well. He's not used to the heavy NHL schedule, so I really think those minutes will be fine. Previous coaches have said he's a fast learner, and we've already seen that first hand in training camp.
I don't think Soderblom or Berggren will beat out the competition for a top 9 role. I think Soderblom makes a better fit for a fourth line role over Berggren. And, I think Soderblom could do well on the powerplay as well.