I started a patch 4 game and have just defeated the intellect-devies on the beach. This is the point where in my previous games, me and Shadowheart leveled up to 2. This time, only I leveled up. Shadowheart needs 9 more XP. In earlier gemes, all characters, even those in camp, had the same XP, I believe. This no longer seems to be te case. Although I don't see this mentioned in the list of changes that was posted here.