This feature will be rolling out today and tomorrow for English speaking users in the US and will work on most phones that support HTML5, such as devices running Android 2.1+ and iOS 3+. To get started, you’ll need to connect your printer to Google Cloud Print. This step requires a Windows PC for now, but Linux and Mac support are coming soon. You can learn more at the Google Cloud Print help center.
Posted by: Tyler Odean, Google Cloud Print Team