Microsoft has updated their Application Developer Agreement. This update accompanies updates for the app certification policies on Dev Center for Windows Store and Windows Phone apps. The updates are not aimed at changes in rules, but to make the Dev experience easier.
Additionally, there is also a 'Developer Code of Conduct' meant to highlight Microsoft's standards. It includes having a unique publisher name and not representing an organization you don’t have permission for (e.g. claiming to be publishing VLC from VideoLAN), having a store account in good standing (providing accurate information, not violating App Developer Agreement, etc.), and not engaging in Fraudulent Activities.
As you can see, Microsoft continues to try to improve the experience for developers and users alike. If you are a developer, you should read the Developer Code of Conduct (here) to make certain you are complying with the rules expected by Microsoft.