Dev Center and Store Update: Improved Sale Capabilities
Windows Dev Center and the Microsoft Store are continually going through updates to make sure both end users and developers have the best experience possible. Dev Center has recently added in the ability to schedule initial promotional pricing and sales of your titles and IAP. In addition, you can now provide discounting on your applications and games along with offer specials for owners of your other applications!
Learn more at: http://dev.windows.com