Would be very Nice, if there would come a new Map from Dessau to Berlin-Wannsee. Because there's is the Rapid Transit, there could be another one from Berlin to Dessau.
I know this route well, also known as RE7 or former "Airport Express Schönefeld". I used to drive them often, even when Dosto trains with 143s were still in use, which were then replaced by 442 Talent 2 trains. At the moment I can't imagine it as a commercial project, but rather as a PC editor fan project. A highlight on the route is definitly the huge Seddin freight yard. Then there is also the impressive Elbe bridge in front of Roßlau or the railway club grounds in Bad Belzig with parked historic vehicles. So I know my way around here. If the terminus is in Wannsee, you should also be able to see Berlin S-Bahn trains to and from Potsdam. Since this doesn't exist in TSW yet, implementation will certainly take a while...