UPDATE: During its event last night, which officially unveiled the Nexus 5X and 6P phones, along with the Pixel C tablet, Chromecast Audio, and second-gen Chromecast dongle, Google confirmed that Android 6.0 Marshmallow will begin hitting Nexus devices next week.
No specific date was mentioned, although as yesterday's report (see below) claimed, it might be next Monday, 5 October. Marshmallow is headed to the Nexus 5, 6, 7, 9, and Player, as rumoured, plus it'll be found on the Nexus 5X and 6P out of the box later this month. From there, third-party phone and tablet makers will start the process of bringing Marshmallow to other non-Nexus devices.
ORIGINAL STORY (28/9/15): Eager to put the big, new Android version on your phone, tablet, or set-top box? Well, assuming any of those is a Nexus device from the last two-or-so years, then you're only about a week away from that happening.
According to Android Police, which is just flooding the Internet with exclusive leaks today (see the latest Nexus 5X and 6P story), Android 6.0 Marshmallow is slated to begin rolling out to compatible Nexus devices on 5 October, which is a week from today.
The story claims that the official upgrade list features the Nexus 5 and Nexus 6 smartphones, Nexus 7 (2013) and Nexus 9 tablets, and the Nexus Player set-top box. And naturally, the Nexus 5X and Nexus 6P will ship with Marshmallow preinstalled when they hit consumers, which we're guessing will also be next week.
Don't see your Nexus device on there? Sorry, folks: according to Android Police, Google has opted not to bring Marshmallow to 2012 devices like the Nexus 4, original Nexus 7, and the Nexus 10. We heard previously that Google was planning to chop those older devices off of the upgrade list this time around, but now the report says it's a done deal.
Marshmallow should hit the Android Open Source Project on the same day, and then once it's on Nexus devices and out in the wild, we'll have our annual waiting game to see how quickly all other phones and tablets get the upgrade - and which ones even get it at all. For example, SlashGear says Marshmallow will likely come to the HTC One (M8) and One M9, but not the original One M7.
If you've got an Android phone that's a couple years old or earlier, we wish you sincere luck in the months ahead. We're pulling for you, especially since Marshmallow sounds like an excellent upgrade over last year's already-great Lollipop.