Whoa.
I'm not sure how developed this thing is or to what extent it will change or will otherwise be altered, but man, this is pretty sick. I am a big fan of the more avant-garde architecture that you see from firms like OMA, MVRDV, H+DM, MAD... and well, this is almost that. It's so atypical; I am a big fan of the overall form and its proportions. I will say that I hope the tallest portion is oriented to the west as shown and not to the east as was previously shown in the rendering from the summer. The progression of low to high from east to west really plays of the neighboring towers better IMO. Nonetheless, I can't wait to see this evolve!
Incidentally, though I realize it's simply an anomaly of how the reflections rendered out, I really think it'd be cool, and playful in an almost sophisticated way, if the glass were all subtle variations in color!