From the looks of it, the "INTERNATIONAL SALKIND VERSION" is not included in this 14 DVD set in a "play-out" version.
(all the extra footage may be in the set's bonus sections)
With that version not included Mitch, your preservation of the full un-cut broadcast version in a good quality is a must!
The info below is from Superman Cinema
"This list is incomplete and shouldn't be taken as gospel because final specs of the set are still under consideration. Supergirl is NOT part of the set."
Superman The Movie disc 1
Theatrical cut *
Commentary track by Ilya Salkind and Pierre Spengler *
Original sound
Dolby Digital 5.1
Superman The Movie disc 2
2001 director's cut *
Commentary track by Richard Donner and Tom Mankiewicz
Dolby Digital 5.1
Superman The Movie disc 3
Taking Flight: The Development of Superman *
Making Superman: Filming the Legend *
The Magic Behind the Cape *
More Special Features TBA
Superman II disc 4
Theatrical cut *
Commentary track by Ilya Salkind and Pierre Spengler *
Commentary track by the three villains ***
Original sound **
Dolby Digital 5.1
Superman II disc 5
The Donner cut
Commentary track by Richard Donner and Tom Mankiewicz **
Original Sound **
Dolby Digital 5.1 **
Superman II disc 6
Special Features TBA
Superman III disc 7
Theatrical cut
Commentary track by Pierre Spengler and Ilya Salkind
Original Sound **
Dolby Digital 5.1
Superman III disc 8
Special Features TBA
Superman IV disc 9
Theatrical cut *
Original Sound **
Dolby Digital 5.1
Superman IV disc 10
Deleted scenes *
Special Features TBA
Superman Returns disc 11
Dolby Digital 5.1
Superman Returns disc 12
Special Features TBA
Max Fleischer cartoons disc 13
All 17 remastered Max Fleischer cartoons. *
Superman documentary; Look, Up in the Sky! disc 14
Bryan Singer commissioned documentary on the history of the character.