Regarding party speculation for CS3, here's what we know so far from Kondo's Dengeki interview:
- The story picks up 1.5 years after the CS2 ending, Class VII has graduated and everyone has gone their separate ways (translation: this is just like how CS2 starts, with everyone split up and Rean on his own)
- Rean is still working under Osborne trying to find his own way. Based on the key art and the screens, he's probably still paired up with Altina
- Sara is no longer an instructor at Thors
- The two new characters in the key visual seem to be Thors students, but he doesn't comment on the actual nature of the uniform, the girl with green hair in one of the screens is a character who has a connection to Rean as well (translation: more harem bait zzzzzzzzzz)
- There will be returning characters from the Liberl games who will join the party
- A certain "someone" from the Crossbell games will have a role in the story
- Rean's remaining mysteries will be revealed
- The new Brave Order system has to do with commands Rean can issue so he's definitely the main character again lol