RSL:
I spent approximately 12 weeks in dedicated study after my application was approved and I scheduled the exam. If you're planning 10-12 weeks of study, you still have enough time to not be one of the first with the new PMP exam (1 July 2020). But if you're going to study for more than that time or have some other foreseeable time sink get in the way, then you may want to wait a little and let others test out the new exam first. It's my personal belief that I never want to be the first to take a standardized exam, and since PMI has advertised that the emphasis of the exam will change, your study material, while useful in practice may not be as useful for the exam.
Good luck!
Harry