I saw one preliminary report that the Nexus 6P was notably more toasty running Android 7.

If you want to go for it, AndroidPolice is tracking the OTA images as they become available (http://www.androidpolice.com/2016/08/22/...us-ota-roundup/).

This requires you to have a boot recovery installed, which requires your phone to be unlocked, which in turn kills off your ability to use Android Pay. (Grrr.) So I'm going to wait until the OTA arrives via the auto-updater.