Codename 'Figment': OG Related Gamemode, available in Build and Zero Build, all squad sizes available.
Codename 'LightBunny': Mini-BR with maximum 50 players, Looks to be only available in Solo.
Codename 'Feral': 5v5 Core Mode, also has ranked.
Codename 'Sprout': Lego Gamemode based on jobs...