Per the Gaming Tailgate website:
Roster files can be downloaded via EA Locker, an in-game feature. You do NOT need to add these users to your friends list. How to get the rosters via EA Locker: From the game's main menu, click on Team Management > Roster Sharing > Download > Download (again). Continue on for full instructions on how to download rosters.
For the roster file, search for the following user ID within EA Locker:
PS3: gamingtailgate (Created by BigWY; Players & Coaches Named, No Edits)
360: Still awaiting confirmation of a complete file from known creator.
For the latest on NCAA Football 13 rosters and their availibility, keep checking this article, the Rosters tab at the top of the page or FreeCollegeRosters.com.