The Verge has received several reports from readers with unlocked HTC 8X and Samsung Ativ S Windows Phones that are starting to see the update rolling out

GDR2 also includes support for Gmail's CalrdDAV and CalDAV implementation, allowing Windows Phone users to continue syncing calendar and contacts after Google announced its intention to pull its Exchange ActiveSync service earlier this year. Google granted Microsoft an extension to allow Windows Phones to continue syncing until July 31st, so the roll out of the latest update comes just weeks before that deadline. The update also includes some HTML5 improvements in Internet Explorer, and improve Skype stability.

  Windows Phone 8 update rolling out with return of Gmail calendar and contacts sync