"We are working on another one. [Producer] Tim Bevan is putting it together as we speak with [screenwriter] Peter Straughan and Tomas Alfredson, so yes it's in development. It did unbelievably well and it didn't cost hardly anything. But things take time. Tim is passionate about making sure we do another one."
Tinker, Tailor, Soldier, Spy was adapted from the John le Carré novel of the same name. The author also wrote the follow-up novel Smiley's People, which follows George Smiley coming out of retirement for another mission. No story details were given for the sequel,