The most accessible and well-known meaning of "Windows Infinity" is a specific satirical browser game. This game is a , designed to mock its most frustrating and infamous features.
No, it is a purely hypothetical concept. It is a detailed "mockup" or "concept OS" created by fans to imagine what a perfect version of Windows could be. The pages outlining its features are for discussion and dreaming, not for actual use. Windows Infinity Simulator