Do y'all think we're gonna see anything new and exciting from Android and iOS in terms of software anytime soon? Most of the features being added to both are mainly just things taken from PCs, custom ROMs, and jailbreaks. This isn't a bad thing, mind you, but I find it all kinda boring. Everything I've seen of iOS 11, Oreo, and the various Android OEM skins & features leave me wanting more.
Maybe Fuchsia (if Google doesn't scrap it) or Andromeda (if Google hasn't already scrapped it) or Android Peppermint or iOS 12 will bring about something crazy. Or maybe they won't, and I just need to get back into the custom ROM scene again.
I haven't been excited for OS updates in years, like you said everything major has pretty much been added. The last cool feature I remember being added to either iOS or Android was split screen multitasking, but I honestly never use it (the only time I did was when Samsung already had it on the Note 4 and I only tried it a few times).
The only thing iOS could add that I'd be excited for would be to sign-in to multiple iTunes accounts on one iPhone, like you can on Google Play. Family Sharing is about the closest you can get to that now, but it's not quite there.
The only thing I'd like in Android is stronger voice integration stuff, but that's already gotten better than I realized (I always wanted to be able to do "OK Google play Bombcast on Pocket Cast" and have it work, and it actually does!).
The only other thing would be additional customization options, like what Motorola does with Moto Gestures; twisting the phone to open the camera, shaking to turn on the flashlight, etc, but be able to do that with any phone at the system level.