Back of the case says Funimation digital. That's on the amazon steelbook preorder
Ok, I finally got around to picking this up.
Here are impressions from someone who doesn't have much experience with standard definition anime to Blu-ray transfers:
Overall, the video quality is blurrier than I expected. Widescreen looks ok. The sound is really great, super crisp and clear.
4:3 mode (manually set through my Blu-ray player): Looks better than widescreen, which shouldn't be a surprise.
Compared to my original DVD release, the Blu-ray actually looks slightly softer in 4:3, which is a major disappointment. This could be due to how my Blu-ray player up scales standard DVD definition content, too.
The only advantage of the Blu-ray that I could see over the DVD is that the color/font of the subtitles is majorly improved. On my DVD, the subtitles are a hideous yellow, chunky font.
The Blu-ray has a typical subtitle font, works well enough.
The Blu-ray menu is also less appealing to me compared to the somewhat unsettling original DVD menu.
On the Blu-ray Disc 1, it's just a still image with some quirky music playing in the background. Haven't checked disc 2 yet.
The packaging is alright. As mentioned by Gooey above, it has an odd layout where disc 2 is permanently behind a small nub for disc 1. Maybe this is usual for steel case?
Overall, if you plan on watching Paranoia Agent in 4:3 and you own the DVDs, in my experience, you should still hold on to them. That may depend on your Blu-ray player's upscaling ability, though.
I mostly bought it to support Satoshi Kon's works and because it's in my personal top 3 favorite anime series. Haven't checked out the special content yet!