Version 6.6 update contains:
New nations to play and make scenarios with:
Quebec, England (not Britain), Isis, NATO, Warsaw pact and 10 others.
New commands for scenario editor:
Remove all units (of a certain player)
Make all facilities neutral.
Nuclear explosion crash fixed.
Various network bugs fixed. Starting and ending alliances should now work in network games. (Net:Diplomacy scenario is now fun)