Few video game companies tinker with hardware like this. Taking a mounted display and making it work really well with your video game is amazing. John Carmack is well suited to this because he deeply understands how this technology all works and I envy him for being able to talk the time and dabble in this kind of work. The video is a fascinating look into the tech he has been working on with head mounted displays. Have to admit, slapping a screen inches from my face doesn't appeal to me, but it the game adjusts to my movements that does appeal to me.

The video drops a few tid-bits about Doom 3 BFG edition in that it will ship with 3D and a few other features. A recent Penny Arcade article goes over the head mounted display and some of the Doom 3 BFG edition design points.

http://penny-arcade.com/report/editorial-article/hands-on-with-doom-3-bfg-and-the-terrible-secret-behind-the-original-games

From the article:

"There was controversy over the flashlight in Doom 3 when the game was originally launched. You couldn’t have the flashlight on while you had your gun out, and the player had to choose which one to use, and flip between them quickly. I thought it was inspired, other people wondered if the future existed without duct tape. The flashlight is mounted to your body armor in Doom 3: BFG, so you can finally use it while a gun is in your hands, although the battery life is limited. My thought on the matter? id sold out. "

I heartily agree with this statement. Doom 3 made a bold choice in many situations between seeing and shooting. In a jump/scare shooter this was magical for me. I know the flash light feature had its haters but I loved the difference. Many times I had my flash light out and enemies would jump out and I would scramble for a weapon. Often that meant I took a beating in the scramble. Sometimes I did fine but it was a choice I had to make.

I hope there is a setting to turn it back to the old method. That said, I have the original box copy so I can always go back to playing it as it was I suppose. Feels a little like some of the changes made to the original Star Wars because of my mad love for Doom. Regardless of how this all shakes out, ill still pick it up as the new stuff really interests me.