I still can't find any reporting on or official listing of the actual roster, but there's a team photo here. Gerrit Cole and Jameson Taillon are there, as expected. So is Wes Freeman. Pretty sure I also recognize Alex Dickerson, Quinton Miller, Benji Gonzalez ...
As with Victor Black, the Pirates are being pretty aggressive with Wes Freeman, probably in part because he's still fairly interesting and he's Rule 5-eligible after the season. Dickerson is skipping West Virginia, which hopefully will work out well.
UPDATE: Tim has the rest of the roster here.
UPDATE: The Marauders just sent out a press release about this as well.