Originally Posted by Y Me:
“What happens if your Nexus is turned off and your serial number comes up?”
No problem, each time you boot up, automatically it will search for an update.
Also as stated before the updates are staggered over a few days, to ensure not all the millions of units try and download from the server in one go.
Also by staggering the download if any issues are discovered with the new build not everyone should be effected.
Hope that clears things up?