Now that Google is pushing the Nexus device to the general public, they really need a setting that ignores any OS updates for 4 weeks so developers have a chance to get their apps fixed. Leave it ON by default, and anyone who wants immediate updates (developers and those of us who bought the Nexus so we could be on the bleeding edge, knowing that it's not called the "bleeding edge" for nothing) can turn it off by going into developer options and checking "Immediate OS Updates" or something. Maybe have a setting at the release level relative to the impact of the upgrade (X.00 releases wait 6 weeks, 0.X0 releases which are usually a new named version wait 4 weeks, 0.0X releases wait 2 weeks).
This was a fairly significant release, and I'm frankly surprised Google didn't decide to call it Key Lime Pie to befit its 0.X0 version increment. It's going to cause some confusion, because a lot of phones that are getting "Jelly Bean" in the coming months are going to be getting some variant of 4.1, and go looking for multi-user support, configurable lockscreen widgets, dreamtime, photosphere, swiping native keyboard, etc, and it's not going to be there.