I don't know how it compares to the depth of Dwarf Fortress at the moment, but there is Towns:

    http://townsgame.com/

I've been watching a Let's Play of it on YouTube recently:

    http://www.youtube.com/playlist?list=PL13C2217355664856&feature=plcp

you can already get pretty nice 3Dish plugins for dwarf fortress the lazynewb pack even comes with stonesense http://img228.imageshack.us/img228/5143/screenshotlv.png also http://www.bay12forums.com/smf/index.php?topic=63484 and http://www.bay12forums.com/smf/index.php?topic=70700.0