Google has provided the tools for developers to create desktop Chrome apps for a while now, but it's looking like Chrome apps are going to be hitting mobile devices too. A GitHub repository managed by a Googler contains tools and documentation for the project. Google isn't really keeping it a secret, but neither is it discussing any official details.
A Google Group post seems to confirm this is an official project, despite the company's refusal to comment. Google developer advocate Joe Marini posted there that the project could be ready for beta testing in January, but anyone is free to fiddle around with the GitHub code in the meantime.