Xross Scramble is a conglomeration of all the Savior fan discs into one semi-cohesive game, a couple relatively short and vapid new Duel Savior stories, and Baldr Force Re-Action.
Duel Savior: The Two Princesses is a new story based around our delightful little antagonistic Princess Claire and a doppelganger who shows up.
Xross Savior is a bit more esoteric. You’re in control of Taiga again, and we get to see our sexy new martial artist, Eska as Taiga gets pitted one on one against every single person in the extended Savior universe. As you beat them, you’re allowed to replace Taiga’s moves with their’s, literally substituting their sprites and attack animations for whichever moves you choose for your own.
Scramble Savior is basically just the old survival mode plus Giant and Tiny modes worked in and a few random challenge courses that really are pretty nasty to try to get through, especially with the smarter AI.
No info on the Baldr Force Re-Action.
[Edited from Tenka Seiha]