Microsoft has its heart set on Metro as being the next big thing. If you want to find out how to submit your Metro-style apps to the Windows Store, there are posts and now a video explaining this process. The basic gist is that there will be roughly a six-day turnaround for signing and publishing a title, with content compliance being the longest factor, as it involves real people. There will be a Store developer portal where developers are encouraged to visit prior to the first line of code. Visual Studio will have a link to the Store portal, taking you to an overview page outlining the app submission process.
The video below outlines some of this, including the very first goal, of naming your app so no one else comes up with your unique calculator app clone.
Source: Microsoft, Engadget(Video)