So the latest version of Dwarf Fortress has finally been release. You can find it here. It has been in development for quite a while and includes a z-axis, alterations to temperature exchange and water flow and more!
Unfortunately, the game's interface is still pretty horrid. But for those who are put off by the ASCII graphics, there is hope! First of all, take a look at this mockup! Pretty sweet! Here's a link to a thread about the development of these isometric graphics. I recommend that any Dwarf Fortress fan lend their support to those efforts!
I haven't had a chance to delve into the new gameplay yet, but I expect to have some commentary on the subject soon!