Sponsor S report: draft D.4.

wiki/src/blueprint/SponsorS/reports/2015_12.mdwn

@@ -236,7 +236,11 @@ adjusted, though):
 
 ## D.4. Document the changes implied by the move to Jessie on our website
 
-XXX
+Our technical writers were busy with other matters, so not much
+progress was made on this front yet, apart of listing the exact
+documentation pages that will need updating. Some new contributors
+joined the effort, and are working hard together to complete the
+update by the end of January.
 
 ## D.5. Release an official version of Tails based on Jessie