or they could use the same zones ,changing the color pallete of the zone , put a 90 min time as soon as u leave the initial circle....8 members cap.

add elite mobs that drop tokens for new sets, add some bosses around that drop items .....like OP version of the fate mobs that spawn in the original zone (Cancer extreme mode 4 example :P).....hmmm lets call it DynAbyss zones