The PFS player universe has been updated with 2012-2013 players and rosters.
There is also a rough draft class in for 2013-2014.
Pro Football Simulator now has players and rosters from 1950 all the way through 2013. There are also league formats that cover just about every professional league in history, including NFL, AFL, CFL, WFL, and the USFL. There are several formats that you can use to recreate the entire history of the NFL, including expansion. This also helps online leagues expand and contract based on the popularity of the league.