Train Simulator developer Dovetail Games  announces they've licensed Flight Simulator X from Microsoft, and plan on bringing the venerable program to Steam later this year in a special edition for Valve's service. They also somewhat vaguely say: "The company is currently investigating new concepts in this area and is expecting to bring a release to market in 2015." Here's word on the Steam edition:

Microsoft Flight Simulator X: Steam Edition will include the Deluxe Edition and the Acceleration Expansion Pack in one bundle. Dovetail Games will bring Microsoft Flight Simulator X: Steam Edition to the Steam online gaming platform for the first time in late 2014.