We have PVP and Non-PVP modes, I would like to see these options explored.
I would like to see faction mode. There are 2,3, or 4 factions on the server. When you die, you re-spawn into one of the factions and must work with your group to dominate resources on the map.
Everyone vs. the Zombies mode. There are increased zombie hordes. You spawn with a basic structure built. It is your groups responsibility (everyone is in the same group, or there are multiple groups on the map) to gather resources to bolster defenses, expand to multiple outposts. All while zombie hordes increase in numbers.