Google just published the factory images of Android 5.0 for all Nexus phones and tablets. If you can’t wait for the over-the-air updates to hit your device, you can download the corresponding image and flash it yourself.
Download the factory image for your device in this page and follow the instructions there or read my quick guide for flashing Android 5.0 into a Nexus 7, which works the same for other Nexus devices.