I know their are rumors saying that it may come with a Micro-LED display, slightly better performance, it could be a complete stand-alone device which means it won't have to be tether to an iPhone just to get texts or calls, better things like slightly better battery life (Which I'm not counting on), better performance, maybe faster charging or a better way to have more battery life, Or it will maybe have interchangeable "smart watch bands" that add extra features like more battery life, Or an glucose monitoring band.
What do you think that the Apple Watch Series 3 will have? And how much do you think it will be?
Micro LED is likely years out from my Readings. But it's certainly a strong possibility for the Apple Watch. Apple actually acquired a company (Luxeview) back in 2014 who developes Micro-LED, so the potential is there. OLED will still likely be used for one More Apple Watch Generation. It has been rumored Apple may use a different Touch display, which the added benefits are unknown based off of past rumors.
I know LTE has been speculated heavily about the Apple Watch, but I don't think it's ready to go mainstream with Apple yet. Only Samsung has really been the only other manufacturer to offer LTE. I actually don't forsee this being as an option in the next Series 3 Apple Watch.
Glucose monitoring is certainly in the works with Apple and they indeed are testing as of lately, but with recent reports due to battery constraints, it's likely not going to be ready for at least another two years. Imagine there's still a lot of research and development with glucose monitoring, but it certainly would be a welcomed benefit by many.
I believe Apple filed a patent for some smart watch bands within the last year, that could be potential be battery powered or offer some type of additional benefit with health sensors.
I am still hesitant that a Series 3 Apple Watch will launch this fall. The Apple Watch is not a device that needs to be upgraded on an annual basis and with the series 2 Apple Watch being a very strong contender for the battery life and S2 chip performance, WatchOS 4 doesn't seem to be to advanced.
I think a Series 3 Apple Watch will launch somewhere between March 2018 through June 2018, along WWDC 2018 during the conference.
That said, what I would like to see additionally for the Series 3 Apple Watch, would be additional metal casings, perhaps a larger size variant for the display, additional watch faces for watchOS 5, a redesigned main user interface with the circulation of all the applications, I would like to see Siri have a voice for feedback.