Likely locks:
Forwards (13):
Aho, Staal, Teravainen, Niederreiter, Trocheck, Dzingel, McGinn, Martinook, Svechnikov, Necas, Foegele, Williams, Geekie (one assumes)
Defense (8):
Slavin, Skjei, Gardiner, Edumundson, van Riemsdyk, Fleury, Hamilton, Vatanen
7 remaining spots out of:
Forwards (9):
Suzuki (presumably since he's under a contract that can be for this year), Bokk (same), Pritchard, Mattheos, Smallman, Lorentz, Gibbons, McCormick, Bishop
Defense (6):
Kaski, Forsling, Bean, Keane, Sellgren (in theory since contracted for this year), McKeown
One assumes that you'd want a lot of defensive depth given it's better to dress an extra dman than to be without one. We already have 8 dmen from the main roster though.
Given that you may not ever get to these guys, I would assume you would want guys like Bean and Keane for practice purposes. If Mattheos is healthy, it might be good to have him around since he missed so much time this year. Bishop & Forsling seem likely with some NHL experience. Lorentz seems like the type you'd want available for the playoffs. I'd assume the guys like Suzuki, Bokk, and Sellgren wouldn't be coming over/up, but maybe. Hard to say what they'll think of guys like Gibbons and McCormick that have NHL experience by kinda suck.
Out of goalies, one assumes you'd try to have Forsberg and Ned as your available options after the top two.