DA
I was quite impressed by that as well. I'd guess it was done with a crane, but there were a couple of odd things. One, my TV seemed to think it was partly "filmic" (25p instead of 50i) - but then it sometimes gets confused on video with little motion. There also seemed to be a very slight colour shift at the point where my TV finally decided it was interlaced, which could indicate a transition from one recording to another - perhaps they repositioned the crane for the second part of the shot, as it goes all the way to the far side of the square.
Or (more likely) it was just one really big crane.
Or (more likely) it was just one really big crane.

