Right now there is a small group of migration boards, mostly DayOnePatch (which is currently down after a massive intake), Waypoint fourms, Slaent, Open Critic (@Open_Critic ).
It seems slaent and Open Critic have taken the largest share. A bunch of folks on the discord are putting together the new forum, follow @ReseteraForum and the #resetera hashtag to find out how it opens. Shinobi and Nibel are Admins and in charge of the project it seems. @Nibellion @shinobi602