the Australian ratings classification system, listed as being developed by Iron Galaxy and published by Microsoft.
Iron Galaxy Studios is a company that's done a lot of technical consulting for other game developers -- it recently helped Capcom bring Street Fighter 3: Third Strike Online to digital platforms, not to mention work on You Don't Know Jack.
According to its webpage, Iron Galaxy is also working on some yet-to-be-announced projects with Microsoft and Twisted Pixel, and it appears as though Wreckateer is at least one of those projects. That's all we know about the game thus far, other than that it's an original title, and it's been rated General for all audiences. Wreckateer, whatever it is, was just classified this week, so presumably we'll be hearing more about it soon.