Thought I'd try to raise awareness about this project as Dungeon Keeper is probably my all time favorite game.
What is War for the Overworld?
A mix of real time strategy and god game. Influenced by Dungeon Keeper, Overlord, StarCraft and Evil Genius. Mostly Dungeon Keeper though. Uses the Unity engine so it will work on Linux, Mac and Windows.
Official Website:
https://wftogame.com/
Link to playable showcase (an interactive preview of units, rooms and atmosphere. updated regularly and will so be updated with actual gameplay, or so I hear.):
https://wftogame.com/demo
Blog and Forums:
https://subterraneangames.com/
IRC:
Quakenet at #WFTOgame
Kickstarter:
http://www.kickstarter.com/projects/subterraneangames/war-for-the-overworld
The video at the top of the kickstarter is voiced by the same guy who voiced the mentor from Dungeon Keeper 1 and 2, just thought I'd point that out.