That's what I fear from seeing a square panel below each window. They say it would be entirely covered with a 2nd skin that is a bit noticeable, starting a few stories above the foot, I think, and might produce the same kind of effect as First's partial 2nd layer. That would be nice.
I constantly wonder what those spandrel panels are useful for anyway. This building claims the same environmental standards as Carpe Diem, French HQE and THPE, which is equivalent to North American LEED (Carpe Diem claims LEED gold). Now Manhattan's
new 7 WTC is certified LEED gold with a simple, light and sophisticated glass curtain, therefore spandrel glass is definitely not necessary to improve energy efficiency/environmental quality.
Would it help to cut costs? Maybe but in fact, they rather appear to be added materials compared to a minimalist glass curtain.
Maybe it's merely some architects' taste.