Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
The Blips are now able to (laterally) fly approaches. The Aircraft API was reconstructed to simplify future additions or changes. ADIRU, FMS, autopilot, etc. are now separate classes. The Settings Dialogs were dropped in favor of docks.