Knowing Google, I don't think this product, as are their others, is primarily meant to generate revenue through sales. I think it's to promote a certain understanding and experience of computing that is currently not available. Perhaps they want to push the web to be more catered to high-resolutions and touch first, before they arrive at native applications. Maybe it's also, like someone mentioned, to bridge Android and Chrome, by supporting touch. Of course the more content on the web, the more revenue for them, as they really are an advertising company. Information is where it's at for them. Their "products" (phones, computers, services), are just a means for them to acquire more information.