Of course it took a long time to put this one out. On the bright side it's detailed and worth the price/time. I'd love to see more and more and more, (shut up and take my money etc.) but they'd also have to be wary of things like power creep.
There has been no official word on whether or not there will be another, if I recall correctly, so until somebody posts an interview with a developer statement all that is going to be posted here are speculation and personal thoughts on the subject.
Use Transvestite curses or the Ghost blades to damage them.~Ahriman