Malcolm Owen, AppleInsider:

A HomePod could potentially help save lives without getting into contact with other people, with Apple looking into 360-degree radar systems that can detect vital signs and medical conditions of individuals.

And:

In a patent granted by the US Patent and Trademark Office on Tuesday entitled “Electronic device with circular radar-antenna array,” Apple envisions a system that could potentially provide more accurate positioning data, as well as other information.

This is fascinating. Not clear just how sophisticated a system this patent might yield, but definitely feels like HomePod might evolve into a sensor, providing intel to HomeKit and HealthKit.