SIN Episodes: Desurgence is the sequel to SIN Episodes: Emergence. It will be avaible on Windows, PS4 and PS3. It will be made by EA, Valve, Ritual Entertainment, and SOE(PS3 and PS4 versions only)
The gameplay is very similar to Half Life 2 and Emergence.
Right after the events of Emergence, John Blade is informed that the mutants attacked and Freeport City is now under marshal law. 3 days later, Jessica Cannon has been healed and she and John decide to stop the mutants and track down Elexsis Sinclare.