Interesting to hear that Metrolinx is trying out some new switch types. It says that the new switches will permit a higher speed than the old ones, but doesn't say how fast that is. From what I've seen, all of the switches on the GO network have turnout speeds of 45 mph (72 km/h) or lower. Here in the Netherlands, there are many switches which allow trains to diverge at track speed (140 km/h). For example, I go through
this one on the way to work, and the train typically diverges around 130 km/h.
I came across
this article describing a new type of hydraulic switch that ProRail (national railway infrastructure manager) was testing in 2015. This particular type of switch is described as having a length of 135 m, a diverging angle of 1:29 and a diverging speed of 140 km/h.
Track speed turnouts would be particularly useful at junctions where trains commonly need to switch between the local and express tracks, such as at Canpa Junction where eastbound local trains split off onto the fourth track.