As promised during SharePoint Conference in Las Vegas the Windows Phone 8 App for SharePoint 2013 has been released and is available for download in the Marketplace. I have included a link to the page below just to speed up the install for those instant gratification types like myself.
http://www.windowsphone.com/en-us/store/app/sharepoint/21951931-4a31-47c9-bf8b-e50c8fb7b4c1
