4K resolution projector for $12,000?
 

I'd rather have one 4K projector. What a waste of resources...and imagine the noise.

it is a good technology, but i cannot see how the program can align picture with accuracy without grabing at high resolution. Do we need a red camera connected to the Pc ?

No, but realize computer operating systems and many programs can be scaled to large resolutions...

You could theoretically play 3D animation/games at that resolution...

Although how useful it'd be is questionable...

This is already done using mechanical alignment, having software to do it for you would make it a snap. However getting different projectors to track colors and gamma, that would be a challenge if not impossible but 12 identical projectors and it should be doable.