This is somewhat related, what googdies were included in the original release of 7th Guest? Do they differ from the new release?
I still have the original on my account as well as the new version so here's a comparison:
Original release contains:
Original Mac version of The 7th Guest
New release contains:
Deleted Scenes (19)
Making Of Featurette
Legacy Version (Windows)
Legacy Version (OSX)
Legacy Version (Linux)
So it looks like what you're getting in the new one are the "Stauf Files", Novel, and Deleted Scenes on top of the original game and extras.