The 49ers announced that they've signed four of their practice squad players to future contracts.  These players are OT Alex Boone, LB Martail Burnett, DT Khalif Mitchell and WR Dominique Zeigler.  All four had contracts that expired after this season.  I'll look up the details and add them but basically I think a "future contract" basically allows a team to lock up the right to that player for next season, but they still have to negotiate the specific details of a contract before then.  As we get further into the offseason we'll have plenty to discuss about each of these players and their potential future with the team come training camp in July.