Google has officially released the final version of the Android 6.0 Marshmallow. The company is currently working on developing Marshmallow factory images for its Nexus lineup.
The official Android 6.0 Marshmallow updates will be rolling-out Over-the-air (OTA) by early October. Here’s a list of the devices that will get the update and an ETA (estimated time of arrival) for each device.

ETA List of Official Marshmallow 6.0 OTA for Nexus devices :
• Huawei Nexus 6P (angler) – Pre-installed
• LG Nexus 5x (bullhead) – Pre-installed
• HTC Nexus 9 (volantis, volantisg) – October,2015
• ASUS Nexus 7 [2013] (razor,razorg) – October,2015
• Moto Nexus 6 (shamu) – October,2015
• LG Nexus 5 (hammerhead) – October,2015
• Google Nexus Player (fugu) – October,2015
Please Note: Factory Images will be available for these devices on the first week of October, if you don’t like manually flashing the update wait for the OTA to hit your device.

Google has ended the support of older devices like Nexus 10, Nexus 4 and Nexus 7 as they will stay with Lollipop 5.1.1 but they will keep getting critical security fixes. Keep your eyes up for future updates.