There is no middle car. It's suppose to be all single end cars for the Eglinton Line and they would couple two together to make a train. Since ML changes their minds all the time, who knows what they want.I'm not sure about the prototypes but here is the Eglinton car Bombardier showed off to Media in October 2018.
It looks like the driver is standing without a seat available or a cab door. But, the other end doesn't appear to have a cab either. Perhaps this was a middle car and both ends had yard controls only?
I assume the 6 cars they're expecting will make 2 complete trains, rather than 6 middle sections.