LED backlighting. This is indeed new and thus still expensive and scarce. The LED feature is certainly good for saving power, and one way to increase the spectrum (“gamut”) of displayable colors. I am not sure how important the wide gamut is for most photography. How often does a photo have colors that fall outside the easily displayable range? And – even if you could display it in on screen – it cannot be shared easily with the rest of the world electronically. And you may or may not have problems printing it.

30 inch. I am more interested in the number of pixels than the physical size in inches. It is easy to get 1920×1080 resolution nowadays because HD TV is getting a lot of attention. You can get that in 24 inch. Just increasing the screen size increases the pitch (more visible pixels) and likely display issues at the borders (due to the extreme viewing angle) unless you go for very fancy LCD technologies. More pixels means more information. More inches means more desk space, weight, costs and power.

But displays is a horidly complex topic. And I have a lot to learn.