It was just this weekend that Microsoft unified pricing tiers to help make universal apps easier, and today they've opened the floodgates to developers and are now accepting Windows Phone 8.1 and universal apps for review. As a refresher, universal apps take advantage of new frameworks in Windows 8.1 and Windows Phone 8.1 to allow developers to build apps once and deploy them across both platforms.
Full story from the WPCentral blog...