Hi Will Monte - yes Jitsi code is fully integrated into UNA - whereas Rocket Chat was only every using authentication protocols, relying on RocketChat to provide the resources.

Jitsi provides Live P2P streaming using Web RTC - depending on bandwidth, it should be stable up to about 30 users, all sharing audio and cams, above that you can live stream via YouTube. There are options for live streaming using your own server (no YouTube) using Jibri component, but this would require a custom setup.
Yes all Jitsi branding will be removed, and we are pushing through App updates so Jitsi can work in UNA mobile apps as well.