The migration is planned to happen on the 19th and 20th of August (European hours). It’s been long awaited, more than 12 years!
Main discussion:
https://wildfiregames.com/forum/topic/115363-a-new-git-based-development-environment/
Migration Plan Details
https://wildfiregames.com/forum/topic/121118-planned-disruption-migration-to-git-and-gitea/