A UI that relies entirely on eye tracking and arm motion tracking, without a single button for 'accept' or 'back' or 'fire' in the case of games seems incredibly limiting. They didn't demonstrate text entry, did they?
I expected to see Apple's headset being demonstrated as a product for professionals, perhaps for architects, product designers, and engineers to visualise their designs for clients. Maybe it could have also found a niche in education.
But no, they seem to have iPad-like use cases in mind, and for that, the price is way too high.