Watched the first four episodes of the Season 5 yesterday and the extras disc.
The episodes look wonderful in anamorphic 1.85:1 widescreen, especially DETOUR and the brilliant UNUSUAL SUSPECTS. The sound is a crisp Dolby 2.0 stereo mix with a french language track as well.
There is an international clip for REDUX and a DVD rom link on DISC 1. The artwork on disc one is a picture of The Lone Gunmen.

The extras disc is a little more abundant than the previous seasons. There is a 20 min doc a mini featurette (2 mins)
6 F/X featurettes with commentary, and 6 deleted scenes (FULL SCREEN) with optional Chris Carter commentary.
Also included is the BEHIND THE XFILES episode a look into the mythology up to season 5.
The usual promos and behind the truth spots round out the disc.
Fox comes through again especially for widescreen owning xphilers.

For more information (on the extras), here's my review of X-Files Season Five (Discs 1 & 6 only):

http://www.dvdtalk.com/reviews/read.php?ID=3648

Cool...can't wait to pick this one up.