I'd love it if the tech really was there though, it would be awesome. I actually think using some flavor of DLP tech and a foveated display with eye tracking might allow for phenomenal pixel density, wonder if anyone is working on that yet.
It's a puff piece. According to their website, they're launching something in 3 days, this is probably just a PR thing to drum up interest.
There is foveated rendering: a rendering optimization technique where you render at higher resolutions where the eye is looking at due to higher visual acuity in a small ~5-degree circle thanks to a large concentration of cones in the fovea of the eye.
This has nothing to do with the actual pixel density of HMDs. Physical pixel density remains an issue, and foveated rendering does not solve that.
edit: Perhaps I misunderstood, are you talking about retinal laser projected displays and concentrating the beam on the fovea?
John Carmack suggested on Twitter that foveated rendering won't be a performance win until a few more generations, when higher-resolution panels are more commonplace. Right now the necessary tracking and layering could actually reduce performance compared to rendering the full scene.
Haven't tried it, but I'd hazard a guess that it would be really uncomfortable.