Android 5.0 Lollipop was a major update for Google’s mobile operating system. As such, it is not surprising that some bugs and issues have surfaced as users begin to put it through its paces on their devices. Google is now getting ready to address some of these issues with the upcoming Android 5.0.1 release. Factory images have begun to appear in the Android Open Source Project (AOSP), a clear sign that OTA updates are not far behind.
Needless to say, the new factory images come with a new build number. Android 5.0.1 comes with build number LRX22C. It is currently available for the Nexus 9 (Wi-Fi), Nexus 7  (Wi-Fi) and the Nexus 10. It will presumably follow for other Nexus devices in the near future but appears to be focused on tablets judging by the devices getting it first.
A changelog is not yet available but the small point release suggests that this is a maintenance release intended to address a number of bugs rather than introduce new features.
There is no word yet on when OTA updates will begin to roll out but it’s likely that we will see them later this month.
Android 5.0 itself has made little headway onto devices so far. It has not even made itw way onto the latest Android Platform Versions report, suggesting that it is only on very few devices..
Source : Google Developers