Pure PvP servers with team based objectives. Worlds will be generated before every match. Imagine a CTF server where towers are automatically created on either side of the map. Players can fight it out on the surface, or try to tunnel into the other tower.
New harder world types to continue game progression (Ex: Alien planets, alternate dimensions, evil worlds, etc.)
Enemy factions that will move into your world, and build their own city. You can slaughter them while they are weak, or let them build up their strength to get better rewards.
More events: Volcanoes, earthquakes, more/improved invasions, etc..
Weather: Seasons, floods, etc..
Farming, and stamina system that gives a bonus to player stats.
NPC and World Interactives
Cleansing Pool (Makes Ebonstone into Stone, and other evil items to non-evil, etc.)