On another note, but still on the topic of GO, I found it interesting that service to Peterborough was not mentioned at all in this announcement. That is one service I have always thought would make a lot of sense and it would be interesting to find out why they have opted not to consider it at the moment.
Edit: There is also no mention of service Guelph or Kitchener-Waterloo which has been an idea discussed a bit lately. It is not totally surprising since both those places are far enough from Toronto that they may not be priorities within GO's mandate. Perhaps VIA will be given the task of providing commuter services to these cities, in which case, we could see more projects yet in a few short years.