I think it's already confirmed that the fatalities in the "fixed" version can't be returned to their original form.
I first played SSV and I was like "WTF? they ruined the series. what's with the shitty backgrounds". the animations seemed sloppy compared to the previous games and the music were horrible. but then I realized that it has the best gameplay out of the five SS games.
then SSVS came. while it has 3 amazing new BGs (each has 2 versions ei: day/night), 70% of the old SSV's BGs (most of them were excellent) were gone in favour to all the new stuff (fatalities, bosses ... etc.)
not only that, but also most of the remaining BGs from SSV were changed a little and they look a bit worse now (I'll post example with pics)
to sum up the changes from SSV to SSVS (unfixed version + Unibios 2):
- Fatalities were added. in addition, the generic finishing moves from old SS games that occured randomly were brought back. not only that but now they occure more frequintly. plus, they added new types (in one of them, the opponent gets torn down vertically)
- 3 new characters were added (Amakusa, Zankuro and Mizuki)
- 2 mid-bosses were removed (one of them was based on Genjuro and the other was based on Ukyo. they just changed the clothes' colors, faces, weapons ... etc. which was lame)
- the gameplay was tweaked a little. the roster is more balanced now.
- the story was entirely removed (in SSV, the story was only availabe in Japanese text)
- around 7 new backgrounds added (3 of them have 2 versions)
the new BGs are: the ocean stage which is shown in the Jap insert of the game, a Japanese village with a small bridge in the back, and a dojo. the rest of them were taken from previous SS games like SS2 and SS4.
- around 20 of the backgrounds that were in SSV were removed.
- the remaining BGs from SSV were edited.