Based on the initial reports and the leaked photo, it is almost certainly a widescreen 7" display (about the size of the PRS-950 screen). This is too big to be a mirisol display. The initial Pixel Qi screens are 10", they will be producing a 7" display (
Pixel Qi Tablet Availability, DIY Screen Success and other updates):
Quote:
New Screen Development: 7″
We are developing a 7” screen for tablets and ereaders that is planned for mass production in H1 2011. Samples will be available earlier, perhaps by late Q4 2010.
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So, it is definitely too soon for a high volume 7" Pixel Qi screen.
There are other variants among LCD screens, but my guess is that the Nook has a mainstream LCD, with a back light and a capacitive touch screen.