Death of a sovereign will cause the rest of the faction to go over to the faction with the best dynasty connections
Sweet zombie jesus yes. Best news since release.
And, hopefully, the harbinger of more dynasty improvements to come? That change alone will be good, but better if defeated sovereigns have their kingdoms split between factions with claims to the throne, those with stronger claims getting a bigger piece, possibly resulting in a sort of civil war. Better yet if dynasty connections have more meaningful diplomatic repercussions while the other sovereign is still alive; a practical game mechanic that encourages you to actually stay allied with a guy your daughter married a few turns back, and penalizes you for turning on them, and vice versa?
Don't get me wrong, this is a great change on its own, but it basically amounts to "if I lose, you can have my stuff" - the dynasty system still doesn't really encourage two kingdoms/empires to work together while they're both actually playing (on the contrary, if you're married into a sovereign's family, you'll want him to lose so you can win his kingdom - you might even try to help the process along..), again I hope more dynasty improvements are to come.