I was just hoping for them to retire those stupid round adaptive icons. They did not. Also it's not clear if the old style of switching "opened" apps will still be there? Because the new one with the full screen preview seems more flashy but less practical(think alt+tab vs win+tab on Windows).
I think the idea was good, it's just too bad so many apps (many by Google) went the lazy path of leaving the icon as-is and adding a white background layer. Also note that they're only circular on Pixel.
I'm really against the idea of having a uniform shape for all apps, it makes it harder to quickly locate them.