Disc 1 of all versions will be footage of the final June Tokyo Dome performance.
Disc 2 will be the complete 25th Anniversary Okinawa Concert (The WOWOW version that we've had for a while was a cut version).
This is the cover for the Nagoya Dome version.
Disc 3 of this version will have footage from the Nagoya Dome performances. The footage on this disc is edited by a Western director, and is supposedly more suited for the tastes of her international fans.
This is the cover for the Fukuoka Dome version.
Disc 3 of this version will have footage from the Fukuoka Dome performances. The footage was edited by a female director, and is more focused on Namie.
This is the cover for the Sapporo Dome version.
Disc 3 of this version will have footage from the Sapporo Dome performances. The footage on this version was edited by a director who specializes in working in idol groups, so it'll probably show off group shots of Namie and her dancers together very well.
This is the cover for the Osaka Dome version.
Disc 3 of this version will have footage from the Osaka Dome performances. The footage on this version was edited by a director who specializes in the dance genre, so it's going to focus on and show off all the choreography.
Last is the Tokyo Dome version. Whereas Disc 1 is footage from the June performances,
Disc 3 of this version will have footage from the May Tokyo Dome performances. The director of this disc will edit the footage in a way to enrich the emotions between Namie and her fans. Not exactly sure what that means, but they probably caught a lot of moments like Namie waving and smiling and doing cute things lol
And like KarenPang said, there's also tons of bonuses depending on where you order your DVDs from.