To all still waiting for the update..clearing your framework data (settings, applications, all apllication, clear- then check system update again) works. I did this twice (in a row) and the update appeared.
The "real" customer service now has become "unreal.":( The phone lines are jammed up, you cannot and WILL NOT get through. Best bet is to buy your Nexus 7 at your local staples.:-\