I've been watching this one as i live in the area. i'm somewhat regretting not taking the plunge and getting a unit here as it is unique. however - the maintenance fees are pretty steep. probably only to go up after the first year. A studio purchaser would have made a good choice.
I can't speak to if the arch is still present in the design or not but what I am fairly certain of is that its shape will not be very evident in the concrete primary structure. The arch will likely be formed with steel elements and cladding a little bit later into construction.