It looks like grey and beige spandral. I guess the darker spandral matches the mullions, so hopefully the white will stand out with more floors in place. I think for me it's all going to come down to the podium and the corner entrance section.
Backstage looks great in that last photo. The white really stands out against the darker windows and mullions. Looking forward to seeing more in the coming weeks!
I'm sad for what they've done to the Sony Centre, the way this mess encroaches on it. It's ugly, clumsy and amateurish beyond belief... and I'm being kind.