Google told us that they will be releasing a new OS update next week which is today. So Moments ago, they followed up that announcement by posting up factory images of Android 6.0.1 for the Nexus 6P, Nexus 5X, Nexus 6, Nexus Player, Nexus 9 (LTE and WiFi), Nexus 5, and Nexus 7 (2013) WiFi and LTE.
The updates are arriving as build MMB29K for most. The Nexus 6P and Nexus Player are getting MMB29M.
On a related note, it looks like they also sprinkled in a few other builds, like 6.0.0 (MMB29N) for Nexus 6P, 5.1.1 (LMY48Z) for Nexus 9 LTE, 5.1.1 (LMY48Z) for Nexus 7 (2013) LTE, and 5.1.1 (LMY48Z) for Nexus 10.