Yeah, judging by the reveal it could be the SSD solution disassembled.
Something I didn't notice the first time around was the 6 second demo render @2:15... any thoughts on it?
Definitely looks like RT lighting, shadowing and reflections going on in that scene. And the AA sampling and the resolution clarity looks beyond anything on the X/Pro.
I don't think there is nothing to be taken away from demo renders. They can be anything from cg target renders to technical experiments that prove infiesable in regular games and whatever, and the actual shots there are not even that mind blowing to start with, and seem to te from the firat Halo Infinite trailers which the deva themselves already did a "making of" video, and it makes ir pretty clear it's a hdge podge of scene by scene solutions mostly to create a cool concept trailer that hopefuly aproximates what the end game will look like but not even them know what that will be yet because its still being built. Remember: game dev is Messy, with capital M and everything.