Classic Next Gen larks.
New helmet dents aside, Halo Studios are switching to Unreal Engine 5 for some fairly straightforward practical reasons.
In the Newswire piece, Matthews adds that the developers want to avoid cultivating false expectations with Project Foundry.

We were very intentional about not stepping into tech demo territory.
I guess all of this adds up from the perspective of managing future development of Halo games.
It just feels like the usual exercise in More Graphics, covering up familiar triple-Ashooting.

Ah well, you’ll always be 343 Industries in my heart, Halo Studios.