User blog comment:Rupert Giles/Global Navigation Update/@comment-6532857-20150108212635/@comment-452-20150112000137

The 31st 29th is still "in January".

Additionally, they stated "Our intention is to re-evaluate the nav performance and the experiment results in January and make any necessary adjustments "

They stated their intention, they did not state that they would, or make a "promise".