In March, all three Resistance games and Gran Turismo 5 will be losing their online functionality as Sony will be shutting down the game servers. The Gran Turismo 5 servers will be closing down on March 20th 2014, followed by the Resistance servers eight days later, on March 28th 2014. Its odd that Sony would shut down the GT5 servers so soon after the release of GT6, but makes sense for the Resistance games.
Sony has also reiterated that the servers for MAG, SOCOM: Special Forces and SOCOM: Confrontation will be closing down on January 28th 2014. Both MAG and SOCOM: Confrontation are multiplayer titles only so the disc will effectively become useless once the servers are shutdown.