Can't wait until, the never ending, construction is over to see what the station is going to look like. There's a few retail and food shops open right now (McDonald's, Starbucks, Tim Hortons, Uncle Tetsu, Booster Juice, Peace Collective, Pilot Coffee Roasters, etc) but more to come!
TD Bank is supplying complimentary WiFi, just make sure to connect to their network. This is handy when having to wait for the train.
There are lots of machines around to buy tickets for the GO or to reload your Presto card or perhaps you'd rather speak to a live human.