At last November's SharePoint Conference, Microsoft announced their roadmap for enterprise social and talked about three phases of Yammer integration: "basic integration, deeper connections, and connected experiences."  (For more details, see the Putting Social to Work post published just after the SPC keynote.)  Today at Convergence 2013 Microsoft provided an update to that roadmap, and shared the details more broadly:

http://blogs.office.com/b/sharepoint/archive/2013/03/19/yammer-and-sharepoint-enterprise-social-roadmap-update.aspx