The odds are pretty good that if you're using a still-supported Nexus device, it's probably running August's security update by now. The factory images became available on Monday of last week and OTAs have been intermittently rolling out since then. The push to AOSP took a little longer and finally included a couple of other tags that were behind schedule. All of the changes have been compiled into their respective lists and the changelogs are ready for perusal.
Google's Android Security Bulletin details the potential vulnerabilities addressed by the August updates, but it's not too rare to see other small bug fixes and adjustments hidden among the changes.
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