[CoryB]

In terms of interchanges on the Perimeter there are four that seem to bee on the "near" term radar:

Waverly - preparation for the HWY 75 bypass
HWY 6 - CentrePort related for the "northern gateway"
HWY 2/3 "Oak Bluff" - high accident prone area
HWY 59 - the long over due one.

The "near" term plan seems to reduce as many at grade crossing from the Perimeter as possible focusing on the 59 to 75 route first under the pretense it is related to the CentrePort project. This means that St Marys and St Annes are currently lower priorities, I am sure in part due to the land acquisitions that are needed at those sites. With the exception of Oak Bluff the other near terms ones seem to largely have the required land either owned or highly undeveloped currently.