KDE Plasma 5.23.2 comes only a week after KDE Plasma 5.23.1 and introduces a big feature for NVIDIA GPU users, namely support for the GBM backend of the proprietary NVIDIA graphics driver. Over time, this should improve the Plasma experience for NVIDIA users in many ways.
If you’re using the Plasma Wayland session, you should know that KDE Plasma 5.23.2 improves the touchpad page in system settings to correctly display options for how you can right-click and addresses a bug, causing maximized windows to become unresponsive to mouse and keyboard input when using the hidden “BorderlessMaximizedWindows” setting.