I think I'm going to call it: we're not going to see 40 tph or 100m trains.
There's a lot of vague language on maybe moving to 100m trains or maybe increasing frequency, but nothing's stated the mechanism for doing so. Will the contract have costed provisions for this? Is this something the city can ask for? Will the cost have to be negotiated at that time, or is it set up front? No one knows.
Oh, and from the PDBC Full Report pg 125:
"Option Performance Comparison
The Financial Case assesses the overall financial impact of the Ontario Line and the two operating options considered in this PDBC. This analysis leads to the following finding: the refined operating concept option uses smaller 80 m trains that carry lower capital and operating and maintenance costs, which reduces the overall cost of the project (compared to the use of 100 m trains in the IBC operating concept option). Metrolinx may consider the use of 80 m trains for the first 30-year operating period, and into the second 30-year operating period to reduce overall financial impact of the project."
It's actually kinda laughable, because the difference in cost is....pretty low.