Today Microsoft released its technical preview version advertising SDK for Windows 8 Metro apps. Yesterday, Microsoft detailed its Windows Store plans and discussed about app monetization in Windows Store. Ad-based apps are one of the business models that Microsoft is promoting and assured that it will support not only its Microsoft Advertising network but also other ad networks. Microsoft Advertising will be working with the top advertisers in the industry to ensure not only beautiful immersive experiences as you can see above in the image but also demand for traditional IAB standard display and Text ad formats. You can download and install the SDK from here.
Source: Microsoft Advertising