Marsha,
What I can say for now is that Boss fights might get some additions, but the current system will also remain in place, so no worries there. Present good ideas will only be kept or improved upon. Even if we introduce a clan interface, nobody will be forced to enroll in one or be kept outside Boss fights.

The expansion should be very familiar to current player. All players will get their own avatar that can be equipped with items, while completing new types of missions and engaging in duels with the other players. We'll have more to announce about this as the launch date approaches. Thank you.