Plasma 5.20 is going to be one absolutely massive release! It already was but this week we added even more to it: more features, more fixes for longstanding bugs, more improvements to the user interface! Read on for details:
New Features
Plasma now warns you when your hard disk or SSD is about to die, and lets you monitor its health in the Info Center app (Harald Sitter, Plasma 5.20)
When using the Breeze GTK theme, GTK headerbar apps now use the same appearance for your window titlebar buttons as other apps (Mikhail Zolotukhin, Plasma 5.20)
KRunner can now be configured to be a free-floating window, rather than glued to the top of the screen (Alexander Lohnau, Plasma 5.20)

It’s now possible to uninstall user-installed KWin scripts straight from the System Settings KWin Scripts page (Alexander Lohnau, Plasma 5.20)
Those of you who became accustomed to the behavior of the macOS Dock can now optionally configure your Icons-Only task managers to not minimize the active task when clicked (me: Nate Graham, Plasma 5.20):

Those of you who were worried about the new “KDE apps remember their window positions” feature being disruptive can now disable it (me: Nate Graham, Plasma 5.20):

Bugfixes & Performance Improvements
Gwenview’s “Sort By” button now works properly and matches the behavior and appearance of Dolphin’s (me: Nate Graham, Gwenview 20.08.1)
Partition Manager no longer fails to create a single EXT4 partition on an unformatted SD card (Adriaan de Groot, KDE Partition Manager 4.2.0)
Ark now uses much less memory while extracting files (Alexey Ivanov, Ark 20.12.0)
Dolphin now detects your computer’s exported Samba shares no matter how you launch it (Harald Sitter, Dolphin 20.12.0)
Discover no longer incorrectly lists as installed things that you installed from a Get New [Thing] window in System Settings but then subsequently deleted in System Settings rather than the Get New [Thing] window (Alexander Lohnau, Plasma 5.20)
Global shortcuts to launch 3rd-party apps now work again (sorry this took so long) Méven Car, Frameworks 5.74)
Fixed a case where Discover could crash while performing updates that include Get New [Thing] content (Dan Leinir Turthra Jensen, Frameworks 5.74)
Fixed a case where Dolphin could crash while sharing files using Bluetooth (Nicolas Fella, Frameworks 5.74)
Add-ons installed using the Get New [thing] dialogs now install properly if they have slashes in their titles (Alexander Lohnau, Frameworks 5.74)
The highlight effect for hovered files and folders in the URL navigators throughout various KDE apps is no longer too wide (Ismael Asensio, Frameworks 5.74)
User Interface Improvements
When creating a Samba share, the dialog now automatically disables the option to turn on guest access if the system’s Samba configuration is set up to prohibit it, rather than letting you try anyway and failing silently, and also checks for the condition where your user isn’t in the correct group (Harald Sitter, Dolphin 20.12.0)
Spectacle no longer copies the file path of the newly-saved screenshot to the clipboard by default (Claudius Ellsel, Spectacle 20.12.0)
Elisa’s “Now Playing view” now has adequate internal side margins and wraps long song titles rather than eliding (me: Nate Graham, Elisa 20.12.0)
Arrows in table view headers now point the direction you expect: down when the biggest items are on top, and up when the biggest items are on the bottom (me: Nate Graham, Plasma 5.20)

Discover’s “Addons” and “Packages to remove” sheets have received visual and usability overhauls (me: Nate Graham, Plasma 5.20)
The System Settings Shortcuts page now permits keyboard navigation (Carl Schwan, Plasma 5.20)
Kirigami Sheets now use more appropriate and visually pleasing colors for their headers and footers (me: Nate Graham, Frameworks 5.74)

KDE apps’ window sizes are now remembered on a per-screen-arrangement basis, just like their positions now are (me: Nate Graham, Frameworks 5.74)
Godot engine files now have nice icons (Michael Alexsander, Frameworks 5.74)
Keepassxc once again has pretty Breeze theme icons (me: nate Graham, Frameworks 5.74)
How You Can Help
Have a look at https://community.kde.org/Get_Involved to discover ways to be part of a project that really matters. Each contributor makes a huge difference in KDE; you are not a number or a cog in a machine! You don’t have to already be a programmer, either. I wasn’t when I got started. Try it, you’ll like it! We don’t bite!
Finally, consider making a tax-deductible donation to the KDE e.V. foundation.