The question is, what were the specs on the PC that was running that presentation.
Okay it looks amazing but it's running MineCraft in low graphics, it doesn't need good graphics, it's like the Nintendo DS consoles the screen is small so if you would make the screen bigger the graphics would suck. I really do like the fact that he's spectating the world and controlling the world like a God, this could be really handy for admins but i doubt this is for public non-official Mojang servers this is probiably for MineCraft Realms wich is hosted by Mojang. If this could be used make architecture/blueprints. unlike Google Glass this looks cool as an accessory.