The main Ubuntu release note covers both many of the other packages we carry and more generic issues.
Released in August 2019, Xfce 4.14 is a modern desktop built on top of the latest libraries. From the release announcement:
In this 4.14 cycle the main goal was to port all core components to Gtk3 (over Gtk2) and GDBus (over D-Bus GLib). Most components also received GObject Introspection support. Along the way we ended up polishing our user experience, introducing quite a few new features and improvements and fixing a boatload of bugs.
Light Locker, our lockscreen since Xenial, has now been replaced with Xfce Screensaver. The new screensaver application is tightly integrated with Xfce and includes a number of features to significantly improve the lock experience in Xubuntu.
Xubuntu 19.10 includes two new keyboard shortcuts to make transitioning from other desktop environments easier.
During this development cycle, the team voted on whether to bring color emoji to Xubuntu. We didn't get quite enough votes to come to a decision, but if you're interested in having color emoji, it's easy to add or remove!
Installing color emoji
sudo apt install fonts-noto-color-emoji
Restoring monochrome emoji
sudo apt remove fonts-noto-color-emoji