They already announced that their Greek scenery of Skiathos would be upgraded with new effects and features, plus the P3D v4 compatibility.
With the latest preview screenshots uploaded, the upcoming free upgrade can be appreciated.
Changelog announced in last August :
• P3D v4 SDK compliant export
• New Autogen (over 50 building types based on real world photos)
• Option to switch between simple and complex vegetation
• New light effects
• Dynamic apron lighting
• Specular surface effect
• Animated & static people
• Improved performance
• Integration with the Scenery Configurator