The second round of N Preview factory images and OTAs are out and most people are updated. The team at Android Police HQ is still digging around to find all of the new additions, but in the meantime, there are a number of changes buried right in the source code. Google posted some of the source code for 'N' to the Android Open Source Project, and we've built a changelog from that commit history.
During the preview stage of a new OS version, Google usually limits the code it releases to just GPL-licensed projects. Unfortunately, that excludes most of the parts of Android where the big new features and UI changes would have happened, but don't count out those changes as boring, they can still contain quite a few interesting details if you look a bit closer.
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