Looks like TTC is looking for manufacturers for a future bus order.
Future TTC Bus order
Document request list Here
R32PA16809 - FUTURE BUS PROCUREMENT OF TTC BUSES The Toronto Transit Commission (TTC) is seeking an expression of interest in order to identify and obtain information from firms interested in participating with future bus purchases. The TTC currently operates and maintains a fleet of approximately 2,000 buses to support the movement of its customers across the Greater Toron
Most likely Finch Express since TTC prefers to use the artics on express routes. Here are the list of routes that could potentially (some will be) be converted to artic operation and the amount of buses that they would need based on the current service summary and when the most buses are needed (usually during rush hour):
903 Kennedy-Scarborough Centre Express (when it merges with 913): with artics possibly 6 buses
905A Eglinton East Express - current 10 buses, with artics 6 buses