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The rumor (based on acquisitions Apple has made) is that it will be based on sweat, using sensors built into new watch bands.

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I read that it would be stricly optical:

https://appleinsider.com/articles/21/07/14/apple-supplier-la...

"Rockley Photonics says that its system uses infrared spectrophotometers to detect and monitor a wider range of health issue than the green LED systems in most wrist devices."

I also remember paging through this fascinating investor presentation document from Rockley:

https://rockleyphotonics.com/wp-content/uploads/2021/06/Rock...

HN discussion from a few months ago on this specific topic:

https://news.ycombinator.com/item?id=27030689

Looking at Rockley stuff in particular makes me hopeful this could be solved, if it's solvable with spectrophotometry at all. I'd even be OK with something larger, perhaps ankle-worn, as long as I don't have to puncture my skin at all.

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