How is that clear when Series 2 is actually thicker than the original Watch? With LTE added, more battery is probably needed. Other components already have to be significantly more efficient to compensate for LTE power if they want same thickness and same battery size.
What's clear is that battery technology is annoyingly behind all other technological advances. The future requires more power, but smaller devices.
Sorry, the bit you singled out ("Clearly,
following with Apple's practices, the the series 3 Apple Watch will be thinner") was sarcasm, I thought it was obvious. My bad. I'm in full agreement with your points. Thinner and LTE and more battery life would be compelling features, but I don't see any of these happening in the fall; I suspect, if time is spent on the watch at the fall presentation(s), it'll more likely be watchOS 4, new bands, maybe a new case color (product red? black ceramic?). Waterproofing, GPS, and twice the screen brightness were substantial improvements, worthy of a new release; I don't see adding a thermometer or barometer as meriting a "series 3" release, I don't see them moving away from their two rectangular screen sizes, and I don't expect LTE will arrive this soon (yes, it can be done in a smartwatch, but the Apple Watch is on a pretty tight size/power budget).
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I honestly can't think of too much I would need and I'm still on S0. I think new sensors would be great, thermometer would actually be really great, never thought of that.
A thermometer would be nice, but I wonder how well it would work. If it measures your body temperature, how well can you do that from the back of the wrist? Under a watch that's trapping in heat, and generating a little of its own? And how useful is that number if you're out and walking around? (I really don't know on that one.) Conversely, if it's measuring the surrounding air temperature, again, how well can it do that in a watch where it's close to your body, inside a rugged waterproof casing, possibly in direct sunlight, and squished up against electronics that necessarily run a little warm?
If (a big if) it could produce accurate readings, I'd love an air temperature sensor, just to know what it's like when I'm out and about (I can check indoor/outdoor temperatures at home over the web).