The Bloor-Yorkville BIA wanted to have construction work limited during TIFF, which is a reason why there was the rush to get the section east of Yonge significantly completed.
They pretty much worked through last winter, so there's no reason to believe that work won't ramp up again once the festival is over.
As for the scramble lights, I think only the southwest corner is missing the signal now.
That makes sense re: construction on Bloor Street during TIFF.
As you correctly stated, only the S/W corner is missing the scramble signal. Sept. 14th:
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