guest-display-names - Display names of guests are stored in the database, can be set via API (not WebRTC only) and are used on returned comments/participants/etc.
multi-room-users - Users can be in multiple conversations at the same time now, therefor signaling now also requires the conversation token on the URL.
chat-v2 - Chat messages are now Rich Object Strings and pagination is available, the previous chat is not available anymore.
locked-one-to-one-rooms - One-to-one conversations are now locked to the users. Neither guests nor other participants can be added, so the options to do that should be hidden as well. Also a user can only leave a one-to-one conversation (not delete). It will be deleted when the other participant left too. If the other participant posts a new chat message or starts a call, the left-participant will be re-added.
read-only-rooms - Conversations can be in read-only mode which means people can not do calls or write chat messages.