Schlossman said on his blog that he believes that only Rodwell, Forbort, and Simpson are confirmed for this fall so far.
It has been talked about Nelson coming in, but Danny Mattson won't be coming in this fall. He will play another year in the USHL, as will Nick Mattson now that Genoway is coming back. So that leaves 14 or 15 forwards on the roster, which is pretty common.
On the defense side, you can't count Hill in on the equation, his role is just a walk-on, knowing that he will never see the ice unless it's an exhibition. That leaves 8 or 9 dmen on the roster (depending on Fienhage), which is also common.
I think the roster is looking pretty good for next season. I'm sure Hakstol has it figured out already.