I just got this set earlier in the week too, but I had to order it from Amazon (I also ordered the Animated Trek at the same time, and STII DC Blu Ray, as I was ordering something else and needed to fill the cart to get the Free Shipping), as I haven't been able to find it in stores in Eastern Ontario. But I had to laugh when the ad on Disc 1 for Star Trek on Blu-Ray was at the end, and the last screen said "Find them online and in stores"! CBS and Paramount must think there's more people buying the sets online than they would get if they were available in stores (I've only seen the TOS Complete DVD set and the TNG Seasons 1-3 box set DVD at my local Walmart, but when I go on Walmart.ca, I see that CBS has split the TNG Complete Blu Ray set up into Seasons 1-3 and 4-7, but they are listed as online only).
But the workprint footage, it looks like it was transferred to DV (I.e. DVCPRO 25) in interlace and then upconverted to HD. Which makes an economical sense, as the work prints themselves were not intended for viewing outside Paramount. Also, with these work prints do we know that they were 35mm prints, or because these were just intended for dailies and off-line editing, where they on 16mm film (analogous to how TNG, DS9 & Voyager dailies were screened & edited on VHS first before the final master was edited on 1-inch & D2 Composite videotape).