So this is super interesting, especially contrasted against Oculus' super conservative play with the Rift S. Some thoughts:
1) This thing is going to expensive. Maybe not Vive Pro expensive, but very likely Vive launch expensive. I would be shocked if it was less than $600.
2) This thing is going to have very high system requirements. There's no eye tracking, and a significant resolution bump, which means this is going to take a much more powerful system to maintain the same performance and image quality.
3) Speaking of which, pixel density is probably not radically improved. It seems like resolution increases have scaled with FOV increases, which means the pixels per degree are probably not radically different unless there's something major we don't know about, like a hybrid/multi-res screen.
4) Those cameras are definitely for passthrough, not inside out.
5) What the hell is that expansion port on the front for? It's covered by a transparent shield, so almost certainly an optical sensor of some kind, and it looks like it sockets into a USB port... But what could this be that would be so cost prohibitive they'd need to market it as an option? The only thing I could think of is controller-less finger tracking, but that doesn't seem like it would add that much cost, and could even be possible just with the cameras, so I really don't know...
I'm super interested in this, but I'm also pretty deeply invested in the Rift ecosystem, so it would depend somewhat on whether ReVive or the coming OpenXR implementation can bridge those ecosystems.