Instead of waiting for the manufacturer of your Windows Phone, or your carrier, to update your handset to Windows Phone 8 GDR3 (aka "Update 3"), Microsoft is giving you the opportunity to update your phone later today; it is a program meant for developers and is designed to allow them to test out their apps and make changes in the code before the GDR3 update is rolled out to Windows Phone 8 users...Source: http://www.phonearena.com/news/Windows-Phone-Preview-for-Developers-lets-you-install-GDR3-update-today_id48269
