My iPad has been plugged into the wall charger for a couple of hours now and hasn't started downloading the update. I had been considering waiting until we're in our city home with the nice fast internet, rather than here in the country with a satellite connection. 624MB...I do remember, though, having similar intentions for the last OS update and it went ahead and downloaded it without my telling it to anyway. I had been griping about our slow internet speed, and here it was my iPad doing this big download in the background.
All my apps have been updating for the past couple of days or so now, preparing for this OS, apparently. I updated iTunes and iCloud on the Windows 7 netbook today and used it to back up the iPad. iTunes says my iPad software is up to date (it's still at 6.x), but the iPad says it's ready to download and install 7. I did not manually direct iTunes to check for updates for the iPad.
As curious as I am about 7, I'm trying to hold off downloading it for now, seeing how it goes for other people, plus expecting some congestion on Apple's servers. Can I wait another few weeks until I have a better internet speed...I don't know.