Master plan
28MB version:
http://hurontario-main.ca/PDFs/masterplan/Hurontario_Master_Plan_Final_LowRes.pdf
139MB version:
http://hurontario-main.ca/PDFs/masterplan/Hurontario_Master_Plan_Final_HighRes.pdf
Okay, so the projected ridership is 110,000 riders per weekday. Just for reference, in North America, only Boston, Calgary and Monterrey currently have busier light rail lines than that.
The projected ridership is quite high so the LRVs will be coupled into two or three car trains (each car has a capacity of 138 people) and boarding platforms will be 60m long. 20 trains will provide 4-5 minute service and the average speed will be 35 km/h (as fast as the TTC subway, if not faster).
The construction will be done in two phases: the northern section, Burnhamthorpe to Downtown Brampton, by 2016; and southern section, Burnhamthorpe to Port Credit, by 2021. I think this is a mistake because the southern section is much busier and denser right now, but that's politics for ya. But I guess they do technical justifications for it also (connecting to the LRV storage/maintenance facility at Highway 407).