Well these "diffusers", or whatever they're, can technically correct a problem with spectrum variation in a way similar to color-correcting filters. Unless I'm missing something, I think that should work. But you're right, technically these could be simply new LEDs with new fancy name that don't exhibit the same problem as earlier Nikon scanners.
And I understand now your point about grain issues, it makes sense actually.
By the way, I'm curious, how well that idea with body-mounted focus dial works? Is it really easy to adjust focus using it, or it's still easier to do manual focus via software? And I must say, since I'm partial to metal, I like the idea of metal case and not plastic.
And one more thing. Isn't it interesting that Minolta comes up with two new film scanners, Nikon came up with three new scanners and Canon is sitting there quietly, while FS4000 have dropped in price couple hundreds bucks in last 6 months or so? What is it a sign that new one is right around the corner? Or the unofficial acknowledgement from Canon that they have missed the boat on releasing new scanner and now they're trying to keep some market share by lowering the price and winning some time, while their engineers frantically work on new scanner?
Curious thing, don't you think?