LogFAQs > #905790604

Oh before you go on, there is a canon drama CD that has cut content that takes place between Chapter 6 and 7. I know you're not planning on playing CS2 right away after this, but it does get brought up as if it happened in CS2 so you should probably get ahold of it! It's about the trip to Ymir Class VII takes together that is briefly mentioned from the beginning of the Final Chapter. It was planned to be a playable event in the game but was cut due to budget reasons.

The English transcription for it is here:
http://www.trailsofcoldsteel.com/cs2/memoirs1.html

It says to finish CS1 before reading it there but I'm 100% sure there are no spoilers for the final chapter in it. Just don't poke around the rest of the site. You might have ways to get the actual Japanese version of the Drama CD though, I dunno, but be careful if you do that as well that you don't get spoilers for the end.

EDIT: You could also just play it safe and wait until finishing CS1 to do it, there's nothing relevant for the Final Chapter here. It's just relevant for CS2 because it gets referred to.