MacRumors published a story that Apple has released the second beta of watchOS 7.3 to registered developers.
Apple Seeds Second Beta of watchOS 7.3 to Developers
Apple today seeded the second beta of an upcoming watchOS 7.3 beta to developers for testing purposes, with the beta available a month after the release of the first beta and over a month after the launch of watchOS 7.2 with support for Fitness+, cardio fitness notifications, ECG updates, and more. To install the watchOS 7.3 beta, developers need to download the proper configuration profile from the Apple Developer Center.
