The rumours regarding the introduction of new questions are true, but they will not all appear suddenly in any single month.
The CAA have recognised that too many people are simply learning the answers to feedback questions, instead of trying to understand the subject. A good example of this problem is the old climb gradient question for which too many people simply memorised 16.6% or whatever it was.
They have now cloned this and a number of similar questions to generate 12 versions of each. This will cause no problems for students who learn how to interpret the questions and do the calculations, but will bowl out those who simply use memory tricks.
Learn the subject, know the CAP inside-out and you will pass the exam. By this I do not mean doing 57 practice runs on every single graph. But know where things are (pages 19, 28, 35 and 53 are invaluable) and practice using the graphs to deduce the answers to things like "what is the effect of an increase in....... on ........? In most cases one or more of the graphs or tables can give you the answer to this type of question.