That map has been discarded, or rather, it was just a test utilizing Unity assets. They were attempting to procedurally generate maps for the game, but weren't able to.
They haven't hinted at a release date so it is best to not make guesses as to when it is coming out, because it might just be the case that coming back to their comfort zone will speed up development from now on. At any rate, they have promised to return to updating their Ci-en page monthly, so we have things to look forward to again.