I hate the incontinuity of the facade 50 storeys up too but it is the section that accomodates some mechanical rooms. It's my understanding that glass isn't possible as they have to vent the rooms to the outside. Still, they could have tried a little harder to get it right.
I have to pick up an SD card reader for my new PC, so I can't get photos on here yet - but yes, from my POV the steel framing done in the last day or two has been very dramatic on the south side, the roof angle looks like it's going to be very prominent.