Hello,
Yag v0.9.4.1 is on the beta branch with a big new feature: the fog of war :-)
The presentation video is here:
https://www.youtube.com/watch?v=dzXwmHfgXXc
And the complete tutorial video here:
https://www.youtube.com/watch?v=aeBHCt7LXxM
Cheers
Cedric