Calling it 8K seems a little dishonest. It's really just 2 4K screens. Still impressive, but certainly not 8K.

They mention that you can use the Vive lighthouses and controllers. Would the Oculus sensors and touch controllers work?

Oculus never opened up their Constellation API , so I don't think so .

I wonder if you can code on it or use it as a general purpose display.

Looks cool, but I feel like this is not very affordable.

It's mostly a cash grab. Manufacturing the headsets is relatively cheap. All of the parts exist. It's the horsepower needed to drive two 4k displays at 90+ framerates. Even a $2000 PC build with current gen hardware would struggle with that.