Got the DK2 out. I think it would greatly benefit from Leap Motion integration. Also the whiteness becomes a bit too much for the eyes, especially while I am typing this. Some sort of intelligent compensation would go a long way. Some code in Visual Studio: http://imgur.com/BJVyAXV.
I feel like they would have to have a mode where the screen didn't move when you did. It's counterintuitive to VR, but I think having the text move around just from natural head movement would be very annoying.
The point is it feels fixed in 3d space, like a monitor. Fixing it to your head movements is not going to work, you'll just have a low resolution monitor stuck to your head