I made a call to a friend at City Hall who's familiar with the project. There won't be any light poles on the Union Station side to maximize space for the hoards of people who walk along this sidewalk during rush hour. Instead, there will be tall light posts on the Royal York side to illuminate the roadway. Besides those, the area will be lit from a combination of lighting schemes: Trees throughout will be lit, the station itself with be bathed in light, there'll be benches on the Union Station side that'll have built in lighting from underneath, and there'll be lights embedded in some parts of the sidewalk.
Too bad about the loss of vintage style light posts but I understand why they'd want to keep posts out of the way of pedestrians rushing to trains and to their jobs.