All I've read about was the multi-level improvement. Which I honestly don't consider much of an improvement at all. I mean, it's hard enough to keep track of everything in one level, let alone several of them. Yeah, it adds some more depth (pun pun pun!), but it's totally unnecessary... you can do pretty much nearly everything right now, and on my 2 year old laptop, it gets really slow when you reach 100 dwarves or so. I can't even begin to imagine how much slower it's going to run with three-dimentional fluid algorithms, for instance.