Just over three weeks ago, Google began rolling out Android 7.1.1 Nougat to supported devices. While the company had confirmed to Neowin that the update would be rolling out to the Nexus 6 - despite not mentioning it in its blog post - it wasn't available immediately. Instead, the only Google devices to receive 7.1.1 so far are the Nexus 5X, 6P, 9, Player, General Mobile 4G, Pixel C, Pixel, and Pixel XL.
Luckily, Google says that the update is still coming, and has issued a statement to Android Police that it will be in early January:
Unfortunately, we found a last minute bug that was specific to the Nexus 6, which has caused the delay of the 7.1.1 OTA rollout. We've since fixed the issue and will be rolling out an update in early January.
The Nexus 6 launched in October, 2014, making it over two years old and beyond the period that Google guarantees Android updates for the device (the company promises security updates for a third year). Because of this, there is no guarantee that the handset will receive future updates, such as Android 7.2, or whatever the next version is called.
Meanwhile, you can keep an eye on the page for Nexus factory images, as you'll see the build there as soon as it's available. Naturally, we'll keep you informed as well.