According to a flock of little birds that invaded this evening, a beta version of the Vengeance editor for Myth III for the PC has been posted over at Antennahead. I don't know if they intended this to be available for one and all... but there it is.

On the heels of that news came this thread in the MythVillage forum, where it is rumored that Vengeance doesn't have support for scripting. El Bastard says that Loathing for Myth II can be used for that, but others have told us that attempting this causes Loathing to crash.

More as it develops.