Call and ask, or have your coach call and ask.
D1s have roster limits (35). Jucos and D3s (not many D2s in our area) are allowed to have more than 35 and some schools even have JV teams, but I am not sure of the roster limits.
I wouldn't think D3s and Jucos would have their rosters formalized until after the fall. These schools have tryouts/workouts in the fall, which are open to everyone.
Some schools (D1s) already have their 2013-2014 rosters posted online.