http://www.informationweek.com/hardware/handheld/google-android-update-to-add-rotating-ho/240008757

We’re releasing Android 4.1.2 to AOSP today, which is a minor update on top of 4.1.1. As a note to maintainers of community builds running on Nexus 7: please update to 4.1.2 at the first opportunity. Future variants of the grouper hardware will have a minor change in one of the components (the power management chip) that will not be compatible with 4.1.1. The build number is JZO54K, and the tag is android-4.1.2_r1. Enjoy, Conley and JBQ

This is a quote from the developers of Android. Some people are saying that this update will include functionality that, in my opinion would be included only in a major revision. Android 4.2 (key lime pie) would benefit from any major visual change. Why waste something like this on a very minor update? Remember, Google is not stupid! Unfortunately, consumers have become accustomed to simple updates being upgrades. This puts undue pressure on coders, designers and architects.