I don’t know about everything new…
1) App Library now has updated Liquid Glass with specular highlights
2) Fixed animation when the AirPlay view is invoked from Now Playing in Apple Music, Live Activities on the Lock Screen, Dynamic Island, or other similar source
3) Phone app keypad now uses Liquid Glass
4) When expanding a platter in the Control Center, the content inside of the platter (ie. Brightness or volume progress, Wifi/Cellular/Airplane Mode buttons) now animate properly where before there were minor visual issues
5) Apple Intelligence and Live Translation expand
6) You can now slide on the current song in the Tab Bar or full screen player views in Apple Music to change the song
7) For a song or album, Go to… actions have been condensed down into “Go To ->” that opens a sub menu
8) When viewing a contact in Phone or FaceTime, “Details” and “Voicemail” now use a proper slider. This change is not reflected everywhere (ie. Messages does not adapt this) for some reason
9) In Messages, the "+" button no longer expands out and up, rather it now expands just outward.
10) In Calendar, the "Calendars" dismiss view button now uses an "X" in the top leading as opposed to a checkmark in the top trailing edge
11) Photos Filter and View Options button now uses an ellipsis icon, rather than the filter icon
12) "Show Map" option in the menu with Filter and View Options
13) "Use as Ringtone" is no longer an option when sharing a photo using the Share Sheet
14) In Notes, the keyboard toolbar can be scrolled even when there's nothing else
15) In Games, the "Invite Friends" button no longer uses a green plus
16) In Maps, the Recents, Find Nearby, and other similar list views use a darker gray (almost certainly a bug)
17) In Settings, some toggles that would not use Liquid Glass now do
18) Home app uses Liquid Glass and light SF Symbol colors more liberally
19) Podcasts gets updated splash screen
20) Apple Books tab bar no longer shrinks when scrolled
21) Apple Vision Pro app now uses a 3D visual render of the device that animates as you scroll under the "Vision Pro" tab
22) Apple Vision Pro app now lets you configure AirPlay Receiver options in the "Vision Pro" tab
23) Under Tips in the Apple Vision Pro app, there's a new "What's new?" section that replaces "Essentials"
24) In jiggle mode, "-" buttons are significantly more blurred than before
25) Apps such as Health and Wallet now let you configure their widgets from the long press quick actions platter where they did not before
I'm certain there's more, but I didn't do a very deep dive as I'm short on time.