Lollipop OTA updates to Google Nexus device has been delayed from November,3rd due to a Bug that Google has already fixed few days ago, so the update are ready and on the way. Android 5.0 Lollipop OTA Updates will start Rolling-out on November,12th to Nexus devices.
Google will probably release the update to the I-Fi only devices first, like the Nexus 10, Nexus 7 and Nexus 2013. Other 3G/4G radio devices includes all Nexus Smartphones (Nexus 5, Nexus 4) and tablets with data connectivity will be update later this Month. Google is also expected to release the Lollipop images for all Nexus devices in the same day (Nov,12th).
Stay tuned for More Info!