TVShowsOnDVD has a press release detailing the October 9th release of the Stargate SG-1 Complete Series DVDs:
THE COMPLETE SERIES
Explore The Entire Galaxy Of The Award Winning Series
With The Comprehensive DVD Collection
Loaded With Never-Before-Released Bonus Materials
Discover All 214 Episodes Plus Four Discs Of Fan Favorite All-New Bonus Content
Spanning 54 Total Discs In Breathtaking, Commemorative Packaging
On October 9th From MGM Home Entertainment
There is a detailed description of the entire 54 disc set. Of note are the Arc of Truth and Continuum promos (the made for DVD movies that are currently in production).
I've been a fan of Stargate since the days on Showtime, and have bought the first 2 seaons on DVD. Once I realized that the series was going to go on quite a long time, I stopped so that I could pick up this set.