I like it when technology reaches a plateau, and what we call state of the art doesn't change for a few years. Progress is fine, but how many people do you know who will put off a tech purchase, because they're waiting for the next new thing that's right around the corner?
I though we had reached such a plateau with 1080p video. The gear all says 'Full HD' implying that it doesn't get any higher def than that. But now we're starting to see manufacturers whispering to the public that 1080p can be topped. We've seen a trickle of display devices that can handle '4K' video with four times the resolution of 1080p, but until now there has been no content to play on them, other than pro video sources not available to the public.
To fill that gap, Mitsubishi has announced that they have developed a 4K2K scaler which can upscale most video sources from 1080p up to 4096x2160 4K, and which is fully compatible with the new HDMI 1.4 standard. The not so minor catch is that it isn't currently compatible with Blu-Ray, presumably for copyright reasons.
To me this all sounds a lot like the megapixel wars that digital cameras went through a few years back. Every new model boasted more megapixels, until people started to realize that there's more to taking a good picture than the resolution of the imager. Personally, I doubt that most people could see a difference between 1080p and 4K on any TV that you're likely to use at home. For digital projection in a movie theater it's great, but I say let's leave it there for now.
Expect Mitsubishi to introduce a new line of 4K2K scaler equipped TVs soon.