Google has announced that OTA rollouts have started, but we have yet to hear any reports that users are getting those updates. Of course, not all Nexus devices are on the update list. Factory images have been posted for the Nexus 5, Nexus 6, Nexus 7 (2013), Nexus 9, and Nexus Player. This leaves out the Nexus 4, Nexus 7 (2012), and Nexus 10, and so far there is no indication that any of these devices will be seeing Android 6.0 any time soon.
If you want to grab a factory image to do a clean install for your device, just head to the source. Otherwise, sound off in the comments when you start to see the OTA update making it to your Nexus. And, if you do get Marshmallow today, let us know what you think of the new features, like Now on Tap.