Earlier today, Google released a beta build of Android 7.1.2 for its Pixel and Nexus 6P and Nexus 5X. Missing from the list were Google’s 2015 Nexus devices, the Nexus 6 and Nexus 9. The company has now confirmed that going forward, these two Nexus devices will only receive security updates and no Android updates.
Nexus 9: Release date, Specs, Apps, News & Reviews
Nexus 6 and Nexus 9 Will No Longer Be Updated by Google; To Only Receive Security Patches Going Forward

Nexus 9 LTE Now Receiving Android 7.0 Update

When Google launched Android 7.0 Nougat earlier this year, several different Nexus-branded devices picked up the new software. The Nexus 9 LTE wasn’t one of them.
Google Nexus 6, Nexus 9 LTE Will be Updated to Android 7.0 in the ‘Coming Weeks’

At the tail-end of August, a few different Nexus-branded devices, including the Nexus 6P and the Nexus 5X, began receiving their over-the-air (OTA) update to Android 7.0 Nougat.
Google is Rolling Out Android 7.0 Nougat Factory Images

Yesterday Google started rolling out the over-the-air (OTA) update for Android 7.0 Nougat for some Nexus devices, and a couple of others.
Google’s Support Site Lists End of Guaranteed Update Timeframe for Nexus Devices

Google has listed the exact dates until which it will be providing guaranteed software updates for its Nexus devices. It is already widely known that Google provides its Nexus devices with software updates for at least 2 years from their availability, with security updates being available for 3 years from availability or 18 months after the device is stopped selling on the Google Store, whichever is longer.
The HTC Nexus 9 is no Longer Being Manufactured

The Nexus 9 was a popular enough Android-based tablet when it first went on sale, but it looks like it’s the End Days for the slate.
HTC’s Nexus 9 Has Been Pulled from the Google Store

Hot on the heels of a report surfacing that suggests HTC might be building two new Android-based devices for the Nexus program, the company’s current tablet is no longer available.
Android 6.0.1 brings power button camera shortcut to older Nexus devices

Samsung added a simple yet powerful feature to its smartphones this year: the home button can be double tapped to launch the camera from anywhere in the interface. Google implemented a similar feature in the power button on the Nexus 6P and Nexus 5X, and it has now brought the useful shortcut to existing Nexus devices with the Android 6.0.1 update.