There's a full doc out there already but I assume KHI staff is waiting for better scans or translations to post anything?
It's mostly character building, which some people desperately needed like Isa/Saix, but there are some plot-important things in there too. Like Demyx talking about how a guy said "May your heart be your guiding key" to him, which I'd wager isn't talking about Xehanort, or how Marluxia never woke up re-completed after his first defeat, being a nobody again already by the time he awoke, which fixes an issue where he'd have been Lauriam inbetween and somehow still joined Xehanort which would be way OOC.