Not sure if you're aware, but Microsoft is changing the competencies related to Dynamics 365 and in that is also mixing up the certification process. Now D365 certifications will have a core component and then a more specific functional exam. The two together will give you the MCP certification for that area. I wrote a little blog detailing that out and my predictions here: https://www.dynamicconsulting.com/critical-updates-to-microsoft-business-applications-competencies/
Aside from that, one of our team members just took the newest MB-300. Not to give test questions or anything, but here's an early preview of his experience. https://www.dynamicconsulting.com/preparing-for-the-new-microsoft-dynamics-365-exam-mb-300/
I'd be very curious to hear what others are thinking or learning as they get ready for this new round of credentials.