Hmm, an interesting thing I just saw on another forum. Apparently, when Ufotable said about "original content", that was actually a mistranslation. The actual wording was:
Since nobody's bothering, Miura's talking about the scenario meetings and how Nasu was talking about this stuff you couldn't figure out from just playing the game and background tidbits.
The interviewer asks him what kind of stuff this was and Miura gives an answer that wasn't put on print.
The interviewer's excited response was that was information that really was new info that wasn't in any of the Type Moon material books. And wowzers.
So, I'm wondering what sort of new information this might be. Things that are meant to be sort-of implied in the VN, but aren't explicit. In particular, I am wondering about Zouken. There's a scene in UBW where Shinji takes Gil into the basement, and he was crushing worms. For a long time, I've heard suggestions that that scene implies that Gil had killed Zouken (or was about to), and that Sakura is therefore safe post-UBW. If that is true, then that scene would make a very good candidate for added material. It doesn't change the story at all (because it happened in the VN, it's just not shown), but adding it would mean that Sakura's situation was resolved.
And, it does make logical sense. The scene with Gil in the Matou basement is kind-of pointless if all he's doing is stomping on a few worms, since the reader at the time is unaware of what the worms really are. So, why include it at all? If, however, it's meant to imply Zouken's death, then that is good reason for it to be there, and they can't be more explicit because it would be a HF spoiler. However, for the anime I doubt they're going to worry about spoilering Zouken's true nature, since they'll assume people know Zero, so they could show his death more explicitly.
What do you guys think? And, also, what other implied scenes do you think they could add?