Audacity 4.0 has been released, featuring a new interface built on Qt, improved clip editing, and various quality-of-life enhancements. The new version introduces a redesigned Home screen, Workspaces, and a rebuilt toolbar and panel system. Some features from Audacity 3 are not available in the new version, but the developers are working on adding them in future releases. The update also includes changes to playback, recording, and audio setup.