Of course, it's possible that Avatar Kinect and Hulu Plus are simply undergoing internal testing at Microsoft and may not be part of the current preview program at all. Still, even if that's the case, the finding could signify that we may see these new features once the upcoming Xbox Live update goes public. We've contacted Microsoft for comment.
In further Xbox Live preview news, Joystiq has received several tips that participants have begun receiving their Halo: Reach preview discs. It doesn't appear that users are receiving retail, boxed copies of the game, but rather plain, boxed DVDs plastered with a warning not to insert the disc into a non-preview console. Using the disc in a non-preview console will result in said console being unable to connect to Xbox Live until the update officially rolls out to the public.
Check out images of the (admittedly bland-looking) disc in the gallery below
Update: Microsoft has informed Joystiq that neither Hulu Plus nor Avatar Kinect are part of the public dashboard preview.