Here's a theory -
There was some speculation here that the org were going to release a new book last year but dropped the idea. The did not bring out a new book this year either. It was pointed out that any doctrinal new light is first exposed at the assemblies. It also appeared that there was going to be some new revelation about the toes of the statue in the book of Daniel but that fizzled out as well.
If there is a significant change in doctrine then it would cause a lot of debate even amongst the GB, after all there are at least 6 people to convince and they would need to iron out all the kinks to get the story to flow logically which would take some time.
What better way to test new doctrine than for a JW of some standing to expose the ideas on apostate boards. Where else do they get moe 'insight' and commonsense logical discussions?
I think if there is new doctrine then we have already been exposed to it and the revealer is 20571point428571. He declares himself as an anointed JW in good standing. He joined both here and on topix just over a year ago and has been writing heaps about new interpretations of prophecies in Revalation and other bible books.
20571point428571's basic idea is that all the prophecy fulfillments of Revelation and other books which the org has identified were simply a minor fulfillment. That is everything from 1914 were correct but just identified on a minor level. In the near future we are looking at these prophecies coming to fruition again but as a major and final fulfillment.
With this strategy the org can declare that most of the things they have already interpreted are in fact all correct and valid but because they were just a minor fulfillment they must now look at a new fulfillment of these prophecies. This gives them a completely new slate upon which they can rewrite their interpretations. They could still brag that they are the only one true religion as they were the only ones that have been able to identify this minor and major fulfillment and there would be no need to back peddle on 1914.
This also gets them over the hurdle of re-identifying the King of the North and the two witnesses.