The Project 2013 Preview SDK download is published. The conceptual, how-to, and reference documentation in the download closely matches the Project 2013 developer documentation online content published on MSDN. In addition, the download also contains:
The top-level online landing page for the Project SDK is Project for developers (http://msdn.microsoft.com/project).
For additional Project-related SDK content, see Office for developers (http://msdn.microsoft.com/office), SharePoint for developers (http://msdn.microsoft.com/sharepoint), and Build apps for Office and SharePoint (http://msdn.microsoft.com/office/apps/). The two articles on Task pane apps for Project are in the Apps for Office and SharePoint SDK, and the JavaScript API for Office reference includes information specific for Project, the ProjectDocument object with eleven methods and three events, and four enumerations for Project. Those SDK downloads are now published:
Want to try out Project 2013?