Google pushes out Android 4.4.4 to Nexus 4, Nexus 5, Nexus 7 and Nexus 10
Usually, the Nexus devices are the first to receive the latest Android build, followed by the Google Play edition devices. The latter are stock Android versions of certain handsets. Without the usual skins and bloatware, these variants receive Android updates well ahead of the regular models stuffed with the manufacturer's software.
Don't expect any big changes. The update reportedly is nothing more than a security fix.
source: Google via Phandroid