Google's rollout for software updates has always been haphazard and unpredictable and the latest 5.0.1 update is no different. Some Nexus devices have received it already while others are still waiting. Last year's flagship - the Nexus 5 - is in the latter camp. But while it still hasn't received the update OTA, Google has at least posted the factory image on its developer website. If you don't want to wait around for the OTA to roll out, you can just head over to the source link below, download the update, and flash it manually, presuming you know what you are doing and all the risks involved. Otherwise you can just continue to play Google's little waiting game for a while...
Source: http://www.gsmarena.com/google_uploads_android_501_factory_image_for_the_nexus_5-news-10493.php
