I'm loyal to the brand for thousands of reasons. And I want to shoot video with Nikon lenses. However, it's hard to feel the love...
Since posting a link is not something one should do here, Google "Ask Olympus: What is Pixel Mapping?" It's a good read and clears up a lot of junk talk about hot, dead, and stuck pixels - none of which is what is going on in the video of the D7K.
What it is, I don't know, but Nikon hasn't helped by straddling the fence.
The only thing that makes sense is that the company legal team wouldn't want them to open a door they couldn't close. Unfortunately for them, in doing what they have done, they have hinted that they can't fix the problem with firmware. Even their Janus-esque post suggests that. It inspires no confidence.
A lot has been made of the lens cap trick to check for the defective pixels, which is why I suggested another, albeit longer and more difficult, method. Just saying, black is black. What else should it be? Red, green, blue, white? Anything in a frame that a filmmaker decides to shoot should be the color he or she decides to make it. Any creative professional should accept no less.
As for the Best Buy sales rep, I truly doubt he know more than the sales rep at the Gap. I know I sound like a cynical old man, but I suspect that real news travels _slowly_ in that milieu, gossip and misinformation, however, is at the speed of light.
I'm waiting out the D7K to see what happens. I might get a D700 for my still work and get a Panasonic AG-101 for filming. It much more expensive route, but the Panasonic has more features - some I don't need since I would be doing other things - audio externally for example, but it depends on the length of the wait. I already have video equipment for the video side of my business, but I would like a larger sensor and would like to use my Nikon lenses. It just isn't happening now with the D7K.