FPS are the only real example I can think of... A platforer wouldn't gain much if anything from VR, over the shoulder maybe?
Cockpit-based stuff like racing and flight sims are going to be the most immersive, because it jives well with the experience of sitting down while being able to look around.,
I actually don't think shooters are going to be as compelling as people think. When you see people use the Rift, they like looking at stuff, and shooting everything and moving on quickly might not be as compelling. I think something like Portal, where you're surveying the environment, and where there's this amazing sense of motion that will feel really fun.
Adventure games, too, are probably going to be interesting with VR. This idea of scouring the environment and looking for clues seems to fit well with how people interact with VR. A detective game would be really cool.
So what tech was there? They pretty much whipped it all up from scratch.
No they didn't. They bought it from companies that had been selling those same parts for cell phones. It's a kit product.
Now they have a modified accelerometer that runs at 1000Hz instead of the stock 250Hz they used in the earlier products, but even that's not really a new piece of technology. Any hardware company could make it. The LCD is just a stock panel they bought.