Bing Maps streamlined entire developer workflow, improving user interface for the Map App Test Tool and Bing Maps Account Center. A new Bing Map App template, "starter project" for creating your map app is available(from File menu, click New, then Project…, and then look under Visual C# \ Silverlight). Template now packages map app into a XAP archive, which can be passed directly to Map App Test Tool via a permalink or user interface.
Template also creates a companion web project, which's automatically added to your solution. When you press F5 for debugging, web project launches Visual Studio Development Web server to host your XAP locally.
To submit your app for review, head over to BMAC, on submit a map app page, simply select Custom map app XAP option, select XAP from your build output directory (make sure to submit only Release builds!), accept submission addendum, and click Submit. You'll be prompted to confirm metadata associated with your map app.
Also incorporated Coin Search sample into SDK, and updated both samples to support new one-click debugging functionality.
Refernce: Bing Map App SDK