We’ll see the fully activated blood oxygen sensor back in the Apple Watch ⌚️ way before the Blood glucose sensor will debut in the Apple Watch ⌚️Apple will be continuing with the development. But not sure when it will come to the watch. Anyway don't think it is a feature that will be here in the next 5 years at least.
Who knows though as Apple could buy some startup company who invented a genius method to reading blood glucose.