If the season opened today, you would, realisticaly, be looking at this:
Plekanec between Bourque and Gionta
Desharnais between Pacioretty and Briere
Eller between Galchenyuk and Gallagher
Those are your "top 9" forwards anyways, so I agree moving a small body - ideally DD or Gionta would be required, and adding a larger one - Penner? Jagr? Door #3? would be a good idea.
White/Prust/Moen look like your 4th line, but Prust will surely see action in the top 9 to spell someone who's hurt or playing poorly, or just provide jump. Parros and Dumont will also get into games for Moen and White, depending on the opposition.
On D we probably start with:
Markov/Subban
Gorges/Diaz
Bouillon/Tinordi
Drewiske as the 7 while we await Emelin to recover.
So basically, Bergevin has work to do, as I don't see them as a playoff squad in our new division, or at very least they are a fringe playoff team.