A new report alleges that a body-temperature sensor is back on for the Watch Series 8, Apple's flagship smartwatch for 2022. The body-temperature sensor will only have limited functionality at launch, but Apple is expected to introduce new health-tracking features and even a new power-saving mode with watchOS 9. Details about why it is taking Apple so long to release an Apple Watch with a blood pressure monitor have also emerged.
https://www.notebookcheck.net/Apple-Watch-Series-8-Details-about-body-temperature-sensor-and-watchOS-9-features-leak.613555.0.html