On the eve of Google's September 15 unveiling in New York, a leaked product listing has placed a number on the company's ambitions: roughly $1,400 for an entry-level Asus Googlebook running AluminiumOS, a new Android-based platform meant to transcend the budget reputation that has long defined Chromebooks. The price signals not merely a new device, but a philosophical wager — that consumers will pay premium rates for an operating system that has yet to prove itself in professional life. Whether that wager reflects genuine innovation or aspirational pricing is a question the market, and Septemb