[Jared]

If you mean this first batch:

based on the last two renders, I see no evidence of any extentions, either Northwards or Southwards.

If you mean for the second set:

I assume they would need to in order to double the capacity. Of course, its still not clear whether they mean double our current capacity, or whether they mean to double the theoretical maximum capacity.

There's also the issue of the Millenium Line trains that go from Waterfront to VCC (and eventually UBC); even if you have 120m platforms along Vancouver to Columbia, these trains can still be no longer than 80m, since they have to fit into the Columbia to VCC stations as well.