Nexus 6 owners just can’t seem to catch a break. It took longer than usual for it to receive 7.0 Nougat, and 7.1.1 took a while too. Then several bugs on 7.1.1 were discovered, but they were fixed in the recent March security update.
[Update: Google responds] Android 7.0 OTA update is being pushed to Nexus 6 phones running 7.1.1 was written by the awesome team at Android Police.