The release of these images usually means that Google is close to offering OTA updates for the Nexus 4 and 6 as well. Check out the direct links below:
Nexus 6 Android 5.0.1 factory image link
Nexus 4 Android 5.0.1 factory image link
If you own one or both of these smartphones, make sure you check out our guide on how to manually update your Nexus device before downloading these factory images.