Think about developing a handheld game that needs to work on all screen sizes (iPhone, iPad, Android, Simbian, etc etc....). There have been efforts to minimize these problems.
Then think about the UI for a web page or game. There have been some pretty successful results, while they are anything but simple.
Now think about adding a 3rd dimension to all those problems. It's not as easy as saying "just make it realistic". There is a reason why lives are spent on UI. It's not an easy task and it just got a 3rd Dimension.
Oh and was it just me or did anyone think it was just a 3D FPS (Like Tribes, Q3, you know.... All FPS?) and not a 3D Displayed FPS.