The presentations from Microsoft Tech Refresh are already available. You can see now the vídeos about Azure App Service Architecture and OfficeGraph.
News
http://www.create.pt/en/news/are-you-familiar-with-office-graph-andre-vala-explains-everything-in-the-european-sharepoint-community-blog/?ano=2015
It's always with great pleasure that Create IT shares its know-how and experience with the community. This time, André Vala (SharePoint Solutions Architect) clarifies what is Office Graph and what is its role in Office 365.