The release candidate for version 4.0 of Substance look-and-feel (code-named Key Largo) is available. The list of new features includes:

• Six new skins: Nebula, Nebula Brick Wall, Autumn, Magma, Mist Silver and Mist Aqua.
  

  

• State-aware theme transitions
• Smart tree scroll
• Glowing icons (buttons, option pane)
• Support for JXPanel translucency
• SwingX UI delegates in SwingX plugin
  
• Border painters
• New title painters: Brushed Metal, Marble Noise
  

Some applications may need to follow the instructions in the migration guide. Target date for release is September 3. Only defects will be fixed until this date.