Unlike other features of Android 4.4, Google Experience Launcher is not technically part of Android (it is technically a component of the Google Search application), exclusively shipped on Nexus 5, and is not enabled in the Android 4.4 updates for any other Nexus device.
Unlike other features of Android 4.4, GEL is not technically part of Android; it is technically a component of the Google Search application. As of November 2013, GEL is exclusively shipped on Nexus 5, and is not enabled in the Android 4.4 updates for any other Nexus device.