NIN just put out an HD FAQ on their new HD DVD & BR title!http://halo22.nin.com/hdfaq.html
Looks like the BD title will have the edge in terms of PQ and angle viewings
Are there any video quality differences between the HD DVD and Blu-ray versions of Beside You In Time?
For all intents and purposes, no - the video will look every bit as good on either version. Technically speaking, the video quality of the Blu-ray version has a slight edge over the HD DVD: It was encoded at a slightly higher bit rate due to the Blu-ray spec's higher bandwidth capabilities for encoded video streams. However, this difference is nominal and would only be noticeable by a pair of well-trained eyes on an extremely expensive professional 1080P monitor.
How do the alternate angles work with the three different formats?
A second angle is presented during Eraser, Right Where It Belongs, and Beside You In Time, allowing you to watch the projection screen imagery uninterrupted. However, because HD DVD and Blu-ray were still new and developing technologies at the time BYIT was created, the alternate angles do not work the same on all three formats.
On the standard DVD, pressing enter enter during the three songs will toggle between angles. You can also use the angle button on your remote.
On the HD DVD, real-time angle switching was not possible, so the alternate angle is included as a standalone feature.
On the Blu-ray, an option to toggle the angles will appear on the pop-up menu during the three songs. Most Blu-ray players will display a multi-angle icon when multi-angle content is playing. On many players you can turn this icon off in the set-up menu.