Man, I really want to see How to Train your Dragon - and I was actually considering seeing it in 3D.
I've been taking a graphics class this semester, and we just learned about color a couple of weeks ago. I can see how adding yellow is a big deal.
Here is a picture of the RGB gamut. RGB can represent every color in the triangle:
Apparently Sharp is not only adding yellow, but cyan, which will reportedly allow them to represent 99% of the colors visible to the eye.