Office and SharePoint 2013 Developer Tools Now Available | Office 2013 content from Paul Thurrott's SuperSite for Windows

A new approach for Office/SharePoint-centric app dev

"Apps for Office come in three categories: Task pane apps that appear in the task pane of an Office application, content apps that appear inside of the document’s content, and mail apps for Outlook 2013 and Outlook Web Access, which appear next to an open Outlook item, such as an email message, meeting request, meeting response, meeting cancellation, or appointment.
Apps for SharePoint extend the capabilities of a SharePoint web site. Users can discover and download apps from the SharePoint Store or from their employer’s private App Catalog and install them on their SharePoint sites."

Office and SharePoint 2013 Developer Tools Now Available | Office 2013 content from Paul Thurrott's SuperSite for Windows