This new version brings many improvements: the accent colour can now be set based on the prominent colour from the current desktop background image (it updates if you use slide-show wallpapers) and it applies to more graphical elements. The global theme settings page lets you pick and choose which parts to apply, and floating panels add a margin all around the panel to make it float while no window is maximised. Touchscreen mode can now be activated by detaching the screen, rotating it 360, or enabling it manually.
The overview effect can be activated by gestures on a touchpad or touchscreen, using the same smooth Wayland gestures GNOME has implemented as well. The application page for Discover has been redesigned and gives you links to the application’s documentation and website, and shows what system resources it has access to. Panels can now be navigated with the keyboard, and you can assign custom shortcuts to focus individual panels.
And much, much more.