@syakoub
I think there's a strong chance they are moving towards releasing maybe all 4, but at least 2 separate parts of the exam at once. Or definitely releasing AICPA and NASBA at the same time.
These are the only possible explanations.
In either case – it's inconsiderate the AICPA/NASBA does this. It's just a non-efficient process, and surprising they can still get away with all this. The world is at a stage of transparency, and this whole process is certainly anything but.
Even when I was applying, I had conflicting information from AICPA and NASBA – one told me I had to send in the CPA Exam Eligibility application and License Eligibility application, the other one said just the exam.