Halo: Campaign Evolved rebuilds the 2001 campaign on Unreal Engine 5
A full remake of the first Halo rather than a cosmetic re-release: the engine changed entirely.
The campaign of the original 2001 Halo: Combat Evolved has been rebuilt on Unreal Engine 5. This is not a remaster with sharper textures but a move to a different engine, with all that implies for lighting, physics and enemy behaviour.
Projects like this are interesting less for the visuals than for what they reveal: how much of the feel of an old game rested on its technical limits. A remake is always an argument about what in the original was design and what was accident.
Source: pcgamer.com