The image really says almost as much information as we have at the moment, but Railsimulator.com have announced that the next version of their Railworks/TS franchise, Train Simulator 2013, will be released on 20th September 2012.
The only other information available right now is included in this image posted to Facebook, which gives some route and loco/unit information – including that at least one current add-on appears to be becoming a default route.
Edit : More detailed informations can be found at The Engine Driver official blog about upgrading from TS2012 to TS2013 and DLC / third party expansions compatibility.
