Now that's a weird aspect ratio, equal number of pixels, but 45 x 46cm ? I thought that a circle has to be a circle, not an oval, on x-ray.

From the information reported, I fail to see how this new product is such a revolution considering the similar products from Hamamatsu and Perkin Elmer that have been available for years.

Even then, cost tends to be a prohibiting factor for many, in comparison with the old Intensifier/camera combo of old.

Going through airports is going to be like the film 'Total Recall' soon

Digital x-ray detectors are mainstream since 10 years ago. And some other companies make flat panel detectors. Samsung's advertising is misleading in saying they are beginning the "x-ray digital era". 
The main fpd supplier: http://www.varian.com/xray/digital_radiography.html

This technology has been available for over ten years. What is the big deal?

As stated above, this is not new technology. See also www.trixell.com another fpd.
Does the samsung fpd need calibrating every 
24hrs? and a constant power supply?
There is a lot they are not telling us about.