The SAFE whitepaper + download was just launched today. See the announcement by Greg Boer at the MSDN ALM blog.
This was the result of lots of hours of internal contribution by the ALM Rangers.
The whitepaper provides both a high level view of how SAFe is realized using TFS, as well as detailed configuration/customization details.
In addition to the whitepaper, this release includes a download of the Visual Studio out-of-box process templates, with SAFe related customizations already made: Team Foundation Server 2013 Process Template Samples - Support for Scaled Agile Framework (SAFe).
This pretty much addresses Gartner’s concerns in their latest ADLM state of the industry report, showing a quick turnaround from Microsoft to get these addressed.