The latest release (1.3c) is now using a new weather API (openweathermap.org) in order to retrieve real-time weather data. For now, only wind speed/direction and air temperature/pressure are used by GEFS but it is planned to return cloud coverage soon. Also, more weather conditions (rain, snow, fog, etc.) are in the plan.
The new version includes a batch of bug fixes and performance improvement.
Have a nice flight.