Train Simulator 2016 is apparently going to be extreme now. Some simulation fans might be looking forward to the addition of "historically significant" trains and the adjoining Drive Assist system. The biggest addition however, is the change to a "Live Service" mode which will bring updates and fixes continually through the year. This will also include free monthly add-ons as well.
Though I've never understood the draw behind this genre of games (with the exception of Goat Simulator), there is a big market for it and this will be exciting for some players. For more info look at the game's steam page.