This would include, in no particular order:

• Disco#info each room once we have the list, this is mandatory for most of the other steps.
• Sort alphabetically.
• Only display items which are rooms, that is category=conference, type=text.
• Only display rooms with more than zero participants.
• Display the number of participants.
• Display the MUC avatar, as per the MUC Avatars XEP.