Makes sense for watchOS 10 to be “the most significant” update for the OS not only because this is the 10th major watchOS, but because this year also marks 10 years since iOS 7, probably the most significant update in iOS history, with its redesign.
I have a 2nd gen SE, so at least I’m good for watchOS 10 support. My old Series 3, which I’ve had since Christmas of 2019, just got dropped last year with watchOS 9, which was not too surprising given its age and because it’s the last Apple device to use the 32-bit architecture, but what was most surprising was that Apple was still selling it, even after it losing support with watchOS 9 was already official. watchOS 9 currently supports Series 4 and later, and there’s probably a decent chance Series 4 will still get watchOS 10, given it’s the first 64-bit Apple Watch, however watchOS 10 should definitely support Series 5/SE with the same processor (especially the SE).
Some things I would like to see with watchOS 10 are the QWERTY keyboard on the 40/44mm watches (I have a 40mm), possibly be able to set the watch up or at least go through setup menus on the watch instead of phone, a redesigned app view with being able to put apps in folders, or maybe even remove apps from the app view and access them from the App Library. I remember one thing with Force Touch was being able to change the dock from recents to favorites quickly, which was moved to settings when Force Touch was eliminated in watchOS 7. The same was true with changing between Grid and List view, though that was brought back by a long press in watchOS 8, so it would make sense for this to also happen in the dock, though with a watchOS redesign, the way the favorite apps work may be different.
I remember when my old iPad 2 updated to iOS 7 (this was the first time I got to experience it, not knowing anything about its redesign prior), I had been busy that day away from the iPad, probably because I was software updating it (I did know how to back then, and that hasn’t changed so much now), when that night, I went to use the iPad, expecting it to look like iOS 6 (which I was obviously used to), only to find the whole UI different.
It’s crazy to think that iOS 7, the first OS with the design we pretty much still use today, was almost 10 years ago now, and that now we may be about to experience this on the Apple Watch this fall, and even that devices that originally ran iOS 7 are/were still getting updates in 2023, with iOS 12.5.7 releasing back in January for devices including the late 2013 iPhone 5s, original iPad Air, and iPad mini 2.
Given that the Series 4 is the first 64-bit Apple Watch, and the 2013 iPhone 5s/iPad Air/iPad mini 2 were the first 64-bit iOS devices, I would expect the Series 4 and later to still get watchOS security updates after they lose support, just like iOS 12/15 on 64-bit iOS devices that can’t go any higher (of course we’ll have to wait and see, as watchOS 8 has not received any updates since before watchOS 9 released back in September, either for the 32-bit S3 (latest: 8.7.1) or for the 64-bit S4/S5/SE1/S6/S7 paired with iOS 15 (latest: 8.7)).