The best - and most fun! - way to find out is to play the game!Is there a list of spells with major changes anywhere? (e.g., fireball type changes).
Besides how manuvers will play out, I'm finding any potential spell changes as the hardest thing to figure out impact through a quick read. Someone commented on how the Wizard seemed buffed from O5e (not a great result if true IMO) but if there are more fireball like adjustments then maybe not. Really hard to figure out without going through all the big spells.

We don’t have a list of changes from O5E because that would be a book.