When I started up my Nexus 7 (2013) for the first time, it downloaded an update, but I never installed it, based on concerns about multi-touch. A notification to install it sat in my notification bar for the last few days. But this evening, it went away. And I checked in the about tablet, and it didn't install: I am still on jwr66n. I went to system update and checked, and it said I was up to date. So it seems like they realized something is wrong with the update and want people to stay on jwr66n.