When the proper Windows Phone 8.1 update rolls out in the coming weeks, it will be bundled with new firmware. For Nokia devices this firmware is dubbed ?Lumia Cyan? and it will enable some advanced features, including Miracast support.
Miracast is a well-received standard for mirroring the contents of one device onto another. If you have a newer TV or have purchased a Miracast USB dongle, you can display your Windows 8.1 device onto a larger screen, which is great for sharing or demonstrating software and media. Prior to Windows Phone 8.1, this support was not present but Microsoft has since added to the latest update.*
Full story from the WPCentral blog...