Do you have some links on this?
These bits here and there are spread across threads encompassing hundreds of thousands of posts. It is a prolific Home Theater and more forum.
Here is a link to their forum page.
http://www.avsforum.com/avs-vb/
Most of their posts are in the HD sections such as HD Software, HD DVD Player and Blu Ray Player sections. These statements are in relationship to features in HD DVD and Blu Ray players. Vista was not the main topic, but how Managed Copy etc will work under Vista etc. You will see that it is impossible to find much with the amount of posting taking place. Search works but not well.
I have given you a summary of two years of daily reading.
LLS