Various sources say that what looks like an incremental KitKat update has been seen in server logs, running on the Nexus 5, Nexus 4 and Nexus 7.
A Website(Link below) says that Server Logs and Analytics show few Nexus Devices running Android v4.4.1 Kitkat with IPs tracing to Google’s stomping grounds in the Bay Area. This means Google is already testing these builds.
In addition to that the famous HTC Rom developer LLabTooFeR has also tweeted details about Android 4.4.1. Apparently the HTC One Google Play edition will get Android 4.4.1 “in the near future,” as firmware version KOT49E.
It is still to early t rely on these leaks and updates as less than 10 % of Android Devices have Kitkat 4.4 running on them.