• @mentions let you mention someone in New Groups. They’ll be able to jump directly to that mention the next time they open the chat.
• Need a reminder to come back to a chat? You can now mark a conversation as unread for desktop. (FYI this won’t sync to your phone app for the time being)
• Emoji-nally available. You now have access to the 117 new emoji that are part of the latest Emoji v13.