Here's a good start to start plucking some information:
There seem to be countless examples across the GTA of developments springing up without sufficient nearby transit connections, parks, libraries, schools and clinics to support the number of people moving in.
www.thestar.com
Toronto's density as of 2018 was around 4,457 people per square kilometre. Humber Bay had around 11,400 people living there based off the 2016 census, St.James Town had around 18,000. Depending on which numbers you look at (development wise on the number of buildings/units proposed) which to be honest i'm lazy to calculate right now, Humber Bay is expected to add another 10,000 residents. St.James Town is fairly close to being maxed out at this point.
St.James Town has a population density of 44,000+ sq.km as of 2016. It has an area of about 0.22km.sq:
Humber Bay is trickier to calculate since most figures lump in Mimico which is generally much lower density, rough 5,000sq.km as of 2016. As I note, these numbers are severely underestimated, however Humber Bay has an area of about 0.60km.sq (area bounded south of the Gardiner, east of Mimico creek, west of Humber Bay river):
Based on the heat map below, Humber Bay had a 110% increase in population from 2011-2016, St.James town when you add it's areas together about ~5-6%. Humber Bay I circled in red, St.James Town in Blue:
View attachment 356707
So based on all those numbers, it becomes pretty evident to see where Humber Bay is, and where it's heading.