Microsoft's Windows 10 event had one thing which really jumped out - a gadget called HoloLens, a visor you put on that sticks holographic images in your field of view. Among its other demonstrated uses, one of the cooler things shown off was the ability to stick Minecraft in your environment, and have it be interactable, not just a set-piece! Could you imagine that, being able to build Minecraft sets in your living room, school, or job? I would've killed for something like this as a kid, because you can utterly wreck your house with Minecraft, without actually wrecking anything!
Not a lot of details are out yet, but the real-time demo was very promising. What would you do with this, if you had it?