As of now I'd go...
Calvert--Johansen--Foligno
Jenner--Dubinsky--Horton
Hartnell--Anisimov--Atkinson
Gibbons/Wennberg--Letestu/Gibbons/Wennberg--Boll/Gibbons--Hjalmarsson--Tropp
Lines 1-3 all have a good mix and are pretty much interchangeable. Each one has enough offensive skill and enough defensive responsibility that I'd be ok with them matching up against any line. I think the "top" line would be the most creative offensive line we could put together and I think this would be good for Johansen. Lines 2 and 3 are what they are. Speed on the wing(Jenner, Atkinson) to disrupt things a bit, stabilizing two way presence up the middle(Dubi, Anisimov) and a "slower" vet(Horton, Hartnell) that has proven offensive ability ready to prove that they still have it.
The 4th line is where I see things as the most interesting. One thing I want to say is that with our team and THIS lineup I see no reason for ANY line to be used as a "shut down" line. We've built a team FULL of guys up front that understand there's more to the game then scoring goals. This brings us to my next point I want to get across. I think Wennberg is good enough to make this team and the person who seems to compare to his playing style the most is Letestu. I really don't see how it would be bad for him to play around 10 min a night centering(or even playing wing) on a 4th line that were putting together, along with throwing him out there on the PP. And don't say **** about having him out there with Boll. He would help him just as much as hurt him. I actually see their games mesh very well with Gibbons. Cycle and crash the net.
Instead of getting rid of guys high in our lineup(Foligno/Anisimov/or even Dubi) to make room for the younger guys we should be looking at these 4th line guys. Like I said, we have other players(like Foligno, Anisimov and Dubi) that can handle the tough defensive matchups. Tropp should never have been resigned. Really what role do we have for Letestu now? He shouldn't be seeing any time on the PP anymore, and frankly I think his PK impact he brings is being quite overplayed. I think at center Gibbons can bring just as much as Letestu along with adding way more speed to the 4th line. I don't know how it will play out but if I had my way I'd go Gibbons-Wennberg-Boll/Hjalmarsson.