> I heard on reddit that some thought it could potentially be the fuselage for the new B-21 Raider, the replacement for the B-2 bomber that already kinda looks like a pretty futuristic aircraft.

I thought the B-21 was going to be a pretty conservative program, so it's design will mostly follow the B-2's. It's a weird angle, but this doesn't really look like that to me.

Not to mention, the thing on the trailer is tiny. The B-2 is not.

That doesn't necessarily mean much. It could be a scale model.

another dude on the same reddit thread said it might be the prop for the spaceplane in Top Gun: Maverick, but the shape doesn't look right

Uh, at a site that is used to measure radar cross sections?

I don't believe they need that for a movie prop...

Too tiny to even be a scaled mockup.