According to reports, the next Apple Watch will not support blood pressure monitoring, as the Galaxy Watch4 series already does. Blood sugar, blood pressure and body temperature tracking will be available on future Apple Watch devices though, starting as soon as next year.

https://www.notebookcheck.net/The-next-Apple-Watch-will-miss-out-on-a-blood-pressure-sensor-but-future-generations-will-be-capable-of-monitor-blood-sugar-and-blood-pressure-levels.558050.0.html