I can't post them, but you can see a few pictures here:
http://www.emporis.com/en/il/pc/?id=116823&aid=8
I've been told that the schedule for the actual construction of the expansion is 2007-2010 or 2011. Not sure why it's taking so long when new foundations aren't needed, but it is being built over an occupied structure. The plaza in back will be temporarily closed and turned into the staging area. I'm not sure but I think one of the atrium shafts will be used for additional elevators and the other will be left open. If so, it shouldn't make much difference as the two shafts are virtually identical.
If anyone knows of any other skyscrapers which were expanded vertically WHILE OCCUPIED, let us know. The only other example the folks at Blue Cross are aware of is the Tulsa office of Blue Cross Blue Shield, which grew from 3 stories to 6 stories while occupied... so they are no longer claiming uniqueness for their building, just for their company's buildings in general!