I don’t know that this is official, but the Charleston RiverDogs list this roster on their web site.
Check out the pitching staff. They have D.J. Mitchell, Manny Banuelos, Brett Marshall and Andrew Brackman. The Yankees like the work Torre Tyson does in Charleston as manager.
It doesn’t look like any of the other minor league teams have set their rosters yet, or at least they haven’t been announced.