Haven't received the notification yet. I was going to sideload it, got into the bootloader, but everytime I would type in:
adb sideload filename.zip
It would just send me to a list of all adb commands. I thought it was because I needed the most recent version of the SDK, but I was getting the same message after downloading the most recent version. Also, I can't get my Nexus 7 back into recovery. I power it off, hold down vol up, vol down and power, but it just sits at a blank screen (not lit at all). I can hear my computer make the sounds when a USB device is attached, but nothing is registered.
I'm just going to wait for the official notification.