After turning on Nexus for the first time I have upgraded to 4.0.2 and then to 4.0.4 in minutes. A few days ago I got the update from Ice Cream Sandwich (ICS; Android 4.0) to Jelly Bean (JB, Android 4.1). The update was smooth as expected, and the new features are interesting. Some of them can’t be used outside US, which is a shame, but other are at least nice.
There should have been also increase in performance and battery life, but I haven’t yet discovered that. The performance was great even with ICS, the battery life is still bad with JB.
Here is what I’m running now:
Android version 4.1.1
Kernel 3.0.31-g6fb96c9 (#1 SMP PREEMPT Thu Jun 28 11:02:39 PDT 2012)