So far, these changes have been discussed on this forum :
- The possibility to ask for enemy's client state regions (actually, Pocus even stated it will be featured in a next patch
see thread here viewtopic.php?f=534&t=97306) and/or the ability to make a separate peace with a client state if WS with overlord stays null and WS with said client state is overwhelming
- The possibility to set objectives for client states (see thead here viewtopic.php?f=534&t=97392)
- The ability to pass through ally's client state territory (Pocus said it might be fixed in the next patch as well, see thread here viewtopic.php?f=534&t=97305
- The possibility to fragment (all of, or part of - depending on the WS) an enemy empire into smaller independent (or client ?) states during peace negotiations, like Rome did with the Seleucid Empire with the treaty of Apamea (and here is why I choose the "Apamea update" name xD)
What do you think ?


