http://opensa.dantarion.com/s4/baseTo103.html
http://opensa.dantarion.com/s4/102To103.html
From what I see, everyone may be wrong.
The files that I reverse engineered that contain hitbox data, much like the "PSA" files in Brawl, have not been changed since 1.0.2. The files marked as changed in the above link were actually changed in 1.0.2, but the changes are in sound and effects files, so its not really clear what they do, and I am not taking the time to look into it yet.
Anyways, the folder called animcmd contains the scripts used for hitboxes and stuff.
Now, there are still files that we don't understand that have been changed, like the main exe has a bunch of changes, but as far as data goes, heres all the stuff.
I may have done something incorrect, but all of the text changes mentioned show up in my diffs, but all of the hitboxes changes I SHOULD be seeing if posts are correct, are not. There may be some global SDI change in terms of multihit moves, but its not in the character files if there is.
Anyways, Dantarion Out.