If you look at the signage elevations chart, the framing is as it should be, curved at 52' (W) X 30' (H) covering 1560 sq. ft. facing both Yonge and Dundas Streets. That section will mount the High Definition Video display board. Above that will be the much longer Tri-Vision Display board (not framed yet) at 108' (W) X 30' (H) covering 3240 sq. feet, also facing Yonge and Dundas Streets.
I think the video screen is going to be a lot smaller than a few people on here seem to think it's going to be. The screen itself is not going to be much larger than the 'superbad' billboard. It'll look good though. I was worried after seeing that PenEqu sign go up that they were going to cheap-out and install a flat panel facing south-west.
Regarding the installation of the screen: I'd be that they'll wait at least until the brackets are up for the Tri-vision. Why would they risk damaging an expensive video screen? I'd maybe even say it might go up close to last.