Not sure who. I don't think there has been an official roster press release as of yet.
However, my girlfriend is working an internship with the team as a Graphic Designer- and apparently she has heard, through the grapevine, Caleb Porter has committed the maximum amount of players he is allowed, which is 5, to the Summit Assault.
Here's the article about the team's welcoming to Akron and the PDL League
Akron Summit Assault
A quote from the article to back my statement up:
"The Akron Summit Assault will be comprised of players mainly from universities and colleges in Ohio."