Jeremy Penter from the ACG YouTube channel claims that 343 Industries has abandoned its proprietary Slipspace engine in favor of Unreal Engine 5.
Penter’s words are echoed by Windows Central editor Jez Corden, according to whom the studio is even actively working on porting the Halo battle royale (codename Tatanka) to the Epic Games engine. He did not provide any evidence to back up his claims, but is actively searching for confirmation alongside YouTuber Sean W.
If this is indeed true, it is possible that the switch to the new engine is connected to the departure of technical director David Berger from 343i, who was specifically working on Slipspace.