Go to deal link leads to the Xbox 360 version.
Please note that a pre-order from this retailer does not include any of the announced pre-order bonus DLC.
Unfortunately they do not have the PC version listed.
A man-made floating city called the Ark, made up of hundreds of separate floating islands, is on the brink of all-out civil war. Originally built as an experimental self-sufficient and 100% “green” habitat, the reported rapid rise of the Earth’s oceans has forced the Ark to become a refuge for humanity. Crammed with the original Ark founders, their descendants, as well as tens of thousands of refugees, the Ark exists in total isolation from the rest of the world. With 25 years of social unrest, the inhabitants of the Ark have reached their breaking point. It’s up to you to decide the future of the Ark and the human race.