Back by popular demand is the DirectAccess TechCenter page. This new page is fully redesigned from the old version, and includes links to DirectAccess documentation for Windows Server 2012 R2, Windows Server 2012, and Windows Server 2008 R2.
You can find the new DirectAccess page at http://technet.microsoft.com/en-us/network/dn791020.
And while you're visiting the Networking TechCenter, take a look at the fresh version of the Remote Access page, at http://technet.microsoft.com/en-us/network/dd420463