Something I noticed that wasn't in the notes:
Share Audio Settings -> Share Party Audio
Before, you could only share everyone's voice in a party if you were Broadcasting. Pretty big news for me. My friend and I have a lot of stupid moments we've been wanting to save/share on Spelunky, and other games.
Oh finally! Yes, more than once i've wanted to share our party reaction to a Rocket League goal only to remember only my voice can be heard in the shared video