The mine craft demo was pretty cool, but just in general it looks like an amazing system. Once they've shrunk the head gear and it's been jailbroked I'll be all over that shit like the nasty rash you get after a night with Manthorp.
I am somewhat interested but reports of how small the real thing's live area/field of view is are a bit disappointing. Had a go on a Samsng GearVR the other day, just watching passive demos, and it was damn good fun. Makes me want to sort out an Oculus Rift or something sooner rather than later.