I’d be cool if you have added clan extras (e.g. gas rats, assassins) in the next season. Also, you might add some additional, other chaos orders besides Nurgle’s non-humanoid species - hounds, huge siege rats.
Furthermore, you could make some adjustments for players who want to play with their lower-level friends (those without access to legend or cataclysm). For example, you may handle it with some kind of cursed weapons lowering the damage or health of the user but increasing the experience of the whole party.