With the age of a lot of these, it wouldn't be outside the realm of possibility to include the original games themselves via emulation or whatever, but there would be snags here and there. I'm sure getting something like original RE3 running on PC or PS4 would be a bit less work than Xbox One, and I can't see Capcom justifying the work needed to make that happen (just an example, I'm sure there are other similar cases).
Outside of including the game somehow they should absolutely include some art, cinematics, and history on the titles. Maybe as unlockables. It's a shame how many of these remasters never even make a hint at the original at all.