For a multiplayer DF, it would be like a MOBA actually.
- procedurally generated world, with choice civ starts.
- one player, controls all this citizens, starting with 7.
- It will play more like RTS: build building -> produce stuff from a menu.
- You'll have standard resources: mining, logging, farming, and eventually tiered building materials: bars, blocks, etc.
- The catch is that the more details, the more info needs to be send to other players, the more laggy the game gets.
- So until the cpu / internet catches up to a reasonable speed of updated 2 to 8 players, the details in the current DF will have to be trimmed down for a mp-df.
- I can imagine say 2 players build fortress next to each other ~ a region apart.
- Player one makes shield and training spears and zerg rush Player 2 type of cheesy RTS tactics.
- Tower rush strats: build a wall, fortification, and sent peasants with crossbow and wood bolts. -- But then player 2 an just start building away from the enemy's building.
- Enemy send 50 war dogs to harrass.
- But then after some surface warfare game, it can becomes blah.
- Player 2 decides to turtle and dig in with an invulnerable drawbridge raised up.
- At which point, Player 1 decides to dig into player 2 and and channels the nearby brook to flood it.
- I suppose, you can incorporate the gameplay of Dungeon Keeper style.
- One player builds, and other players try to send their squads to attack.
- Squad can be military, miners, mechanics, etc.
- It would be interesting to see dwarven engineering at work beyond weapon traps traps and cage traps.
- All kinds of minecart, water drowning chamber, magma weaponization, and maybe even megabeast usage for defense
- There are plenty of ideas that can come from playing or even just reading the many succession forts here.
TLDR: RTS style management, MOBA style warfare, with detail of Dungeon Keeper, lag-free for 2 to 8+ players.