The last staging branch was merged into the master branch on December
11.

According to the 3 week staging cycle we are trying to adhere to [0],
this would mean we freeze the current branch on December 25 and try to
merge it on January 1.

These dates are inconvenient for many people. I propose we freeze the
branch and start building on December 27, and try to merge on January 3.

[0]
http://lists.gnu.org/archive/html/guix-devel/2016-10/msg00933.html