Linux 64 bit!
We're just waiting on confirmation from Desura.
The 64 bit version for Linux should be ready for testing once we are approved. A 32 bit version is just a matter of time.
If you have the time, we'd love to show this off to the Linux community. Please spread the word, and we hope to have a large armada of Penguins! :)
EDIT : an explanation about our porting process, so the Linux community can be clear about our efforts.
So far, our build compiled and ran under Linux, and most of the effort required package management and also porting over sources mostly AntTweakBar, GLFW and Pyro. The rest of our sources are all C/C++, and have no further dependencies that are operating system specific.
For us, it's a matter of completing the base build porting over, the rest of our code is trivial to port, and the grunt work is mostly un-mangling system specific stuff.