The ACCP 6.3 study guide is being worked on at this very moment. I would expect this somewhere in the next weeks on the website.
I would compare the current 6.1 study guide and the new 6.3 guide to estimate if I would have enough knowlegde and confidence to do the updated exam. My personal feeling is that if you would pass the ACCP 6.1 with enough margin, you should be able to pass the ACCP 6.3, without any guarantees.
Herman