Good question.
First I think Atkinson is a goner one way or another. Probably through buyout, as I doubt he has any trade value. That would mean a $2.36 cap hit this season (cap gain of $3.52M) and $1.75M next year (cap loss of $1.75M because his contract would be done if not for the buyout).
So if they buy him out, that gives the team about $4M in cap space ($3.52M from the buyout, and the current $500K of space).
Ellis and Johansen together take up $10.25M.
Assuming Johansen is headed for LTIR at some point, that leaves 11 forwards under contract. If you add Michkov, there's your 12, and he will only count about $985K on the cap.
I feel like they will acquire at least one forward in the summer and move one or more out.
Right now there's 5 defensemen under contract (Sanheim, York, Drysdale, Seeler, Risto), and one RFA in Zamula. If they re-sign him, there's your starting 6 barring a move on defense.
Goaltending is set.
So, I honestly don't know how different the lineup will be given what they have signed. That will require moves, and perhaps Farabee is the asset they use to acquire a C?