The players have spoken, and of 153 responses, 64.1% said they would prefer a major update to come first, addressing the AI and adding major new features, before adding more campaigns.
So the current version 5.2.5 will stay on the default branch for some time, and in the meantime I will start work on version 6 and once I've added a few new features, I'll put it on a separate preview branch for player testing. Barbarossa is still coming though; I'll see if I can create a pair of 1941 German/Soviet campaigns for the preview branch to help test the new stuff.
Thanks to everyone for their votes, and for your continued support of ArmCom2!