Back in December of 2016, Google released Android 7.1.1 Nougat to a variety of different Nexus-branded devices, but the Nexus 6 wasn’t included in the first wave.
An issue with the software caused the delay, but Google eventually confirmed that the software would still arrive on the hardware. Google said it would be sometime in “early January,” and, sure enough, the update is now arriving for the Nexus 6 out in the wild.
Both the OTA image and factory image is available for the handset, with the build number being N6F26Q.