Better battery life, or power efficiency: The Apple Watch Series 2 already improved on the original Apple Watch battery life. It now lasts around a day and a half to two days on my wrist versus a day before, but it's still a battery-challenged device. Worse, if you're a runner who uses GPS, battery plummets fast. Battery life is tough to achieve on something that's small and powerful..but I'd still like to see it get towards 3 days or more. Maybe it could have a lower-power smartwatch mode. Charging every day, which is what I still basically need to do, isn't great.
Sleep tracking: iOS 10 now has a sleep-reminder function called Bedtime in its Clock app, but the Apple Watch still doesn't log sleep, Third-party apps can serve as workarounds, but integrating real sleep tracking (or sleep iphone case protector logging) into Apple's Activity and Health apps would fill one obvious missing gap in Apple's wellness picture, Most fitness bands include sleep tracking out of the box, Of course, sleep tracking would go hand-in-hand with better battery life: the Watch needs to get to a place where it's not assumed that you're charging it overnight, For this reason, sleep tracking feels like it needs new hardware..
An altimeter. The Apple Watch Series 2 doesn't measure elevation, and neither does Series 1. But other fitness trackers and watches feature barometric altimeters. They're useful for recording stair-climbing stats, among other things. Fitbit's flights-of-stairs-climbed metric is something I've found helpful as a take-the-stairs motivator. The iPhone measures altitude, but Apple Watch does not. New sensors? Optical heart rate sensors just aren't all that wonderful. No wrist-worn tracker with optical heart rate that I've ever worn has not had some fluctuation, or measurement weirdness, at some point or another. Maybe a more accurate heart rate sensing technology could be an answer. More advanced health-sensing wearable sensors are in the works from Samsung and Alphabet, and perhaps Apple has something up its sleeve too.
LTE? Maybe, I don't need a watch that has its own cellular connection, like Samsung's S2 and S3 watches have, or the LG Watch Urbane LTE, At least, not the way it currently works, Cellular plans still aren't friendly to how wrist gadgets work with cellular -- not for me, at least -- and small watches don't do enough on the network to justify the effort, Watches either need to take a battery hit or get larger to accommodate the longer battery life, I haven't tested the Samsung Gear S3 with LTE, which may have solved the problem of a phone-connected watch..but I'd prefer a watch that finds ways to connect to other gadgets and places better, iphone case protector versus connect to LTE, Unless, of course, someone cracks a way to make LTE-connected service feel more functional or necessary, or affordable..
Verily, Alphabet's medical business, previously showed off smart contact lenses. The health watch is described as a "cardiac and activity monitor." It includes both an accelerometer and gyroscope to measure movement, which are the same sensors used in the Apple Watch and Fitbit trackers. The outer ring of the watch can be used to measure a person's electrocardiogram, while an optical heart rate sensor resides on the back. Other sensors on the back may also be used to measure galvanic skin response, which is used to monitor stress levels.
