I love those pics. They show all sorts of little items I've been wondering about like barriers, etc. The starting gate is up now and visible in a couple of the pics, and you can clearly see the red crane is working on vertical construction of the amphitheater (or possibly the tower).
I was at the Formula Expo, and there was a company that does helicopter tours of the hill Country, lakes, downtown Austin and San Antonio, and now the F1 track.
http://www.austinhelicoptertours.com/austin/circuit-of-the-americas-austin-tour.html He had several aerial photos from just a few days ago which I have not seen anywhere on the web... wish I had asked permission to photograph some of them!
Also at the Expo, I learned at the RunTex booth that there will be a race at CoTA (5K?) on November 3rd. Two weeks before the USGP. It's not publicized yet, but they said it is happening.