If you are able to collect enough stamps in Rare Replay from completing challenges you will unlock special feature videos ranging from interviews to videos of unreleased games. The fine folks at XCageGame just unlocked the video for the unreleased flying vehicle game Tailwind.
In Tailwind the only mode of transportation in the world is flight. You would play as the owner of a small courier company fulfilling contracts and making money by completing them. Below you can watch the video that can be unlocked and viewed in Rare Replay:
From the prototype in the video you can see the protagonist being controlled on the ground before getting into a vehicle. There seems to be many different vehicles included in Tailwind from a prop plane and blimp to a helicopter and cargo plane. The world you can fly in looks to be huge with lots of different cities and islands to explore. The terrain varies from beaches to forests.
In one scene of the prototype the helicopter picks up a house with it’s crane. This is most likely a utility used by the helicopter to complete a contract mentioned earlier.