Nothing big, just a tweak to a few things to compensate for Episode Five. Big, if you're playing Sydero's route as now in Episode Four you lock in with her.

Other things changed is:

•  a few tweaks to the poly branch
• Amari's scene is now universal for anyone not romancing anyone so it's now a problem period and not something that's just hidden in her route

And that's pretty much it. So you don't have to replay if you're romancing one of the others not including Sydero.