A new report by Rebs Gaming notes that the mode is akin to "Super Big Team Battle," though whether it's standalone remains unknown.
Remakes for Halo 2 and 3 are also reportedly in early development on Unreal Engine 5, with alleged teases appearing in Campaign Evolved.
The next mainline Halo title will reportedly feature multiplayer, but Microsoft is seemingly continuing on the remake path until then.
Switching to Unreal Engine 5 "allows us to put all the focus on making multiple new experiences at the highest quality possible," says studio head Pierre Hintze.