In order to make the best use of dedicated funds and assist with other theocratic directives, the Governing Body recently adjusted the project completion date from December 31, 2016 to September 1, 2016.
Aha! so, the completion by 4 months earlier is NOT because they worked fast and everything went so good, they are actually cutting it short because of funds.
PS: I have heard comments already from some brothers saying that they will finish earlier because of some kind of divine approval.