The screenshot below contains the playback controls, volume controls and the new PlayQueue.
Interaction with the application has fundamentally changed, as you'll notice when I publish the new version. It's now possible to Enqueue and Dequeue tracks in the PlayQueue.
Default 'click action' in the Playlist Track View is to Enqueue track.
If you long-click a track or a playlist in the Playlist View a context menu popups, with options to Enqueue the song(s).
Default 'click action' in the Search Result is to Enqueue track.