Londo111's observation is utterly correct. Although Witnesses themselves will make sure they look enthusiatic - and even shed " tears of joy" when holding
their precious new releases in earshot of others - they seldom study those publications studiously. It remains telling that the main "students" of Watchtower publications are those who have either already left the organization - literally - or those still in who would leave if circumstances allowed.
Gayle is also correct: This time last January, the yearbook for 2013 was already available for downloading. Hard copies are usually available in the congregations in January.
A change is always possible. Up until recent years, the annual worldwide country-by-country report on their preaching work was duplicated from the yearbook in the January (and more latterly, the February) Watchtower magazines. It no longer features in its entirety in that magazine - apart from selected "brag" worthy highlights. This is a smart move: It does not risk inadvertently highlighting "strange" and/or unflattering features such as the year-by-year increases in the memorial partakers and the not small number of countries that have not grown much in numbers of active Witnesses for several years (e.g., Japan, Denmark, New Zealand, etc).