Not sure but if you are looking for another "Minecraft" shooter, you should check out Murder Miners. Greenlight
I have it on Xbox 360 and it is awesome. Last I heard/read from Jforce is that it is in the Top 100 on Greenlight so it could be released in the next batch (would still have to wait for its official release obviously) but it is about 99% coming to PC.
Seems quite interesting actually. And appears to have more customization to work with than Ace of Spades does. I will follow its progress towards a PC release.