So, there is at least one build of the game floating around on the internet. I won't say where, because it is an old build that is far worse than the current one. If you would like to try the game, I would suggest waiting for the final version to be released, as your experience with the old build probably won't be that great. We have been play testing extremely often, and the final version of the game will hopefully reflect that.
I estimate that the final version will be released to the public sometime in January/February of 2012.