This video is a quick video tutorial on how to use the new In-App upgrade feature. With a new API call inside the SDK 1.1.1, you can have your application launch the AppUp Center and have a specific app already showing. This is extremely powerful way to advertisement and encourage customers to purchase apps.

Below is the link to the article if you like to read a the tutorial as well.
http://appdeveloper.intel.com/en-us/article/adding-in-app-upgrade