It was announced the Office 365 exams (70-346 & 70-347) are being retired, here are some further details and a few suggestions for those who are interested in these exams and what comes next. I took these exams earlier in the year, so I have a big interest in this topic, I don't have any insider information but have read up on the available information and I know even a month later some IT Pros have missed this news. This is all may be subject to change. I'll update this post with more information as needed.
February Update: Exam retirement extended until April 30, 2019. See this post for details.
Announced around Ignite 2018, Microsoft launched the new job role certifications and training. This is to better reflect the work and tasks the people do in their day to day roles and the level of expertise that this requires as well as how this is tested.
Existing 70-346: Managing Office 365 Identities and Requirements exam is retired March 31, 2019
Existing 70-347: Enabling Office 365 Services exam is retired March 31, 2019
New replacement exams MS-100: Microsoft 365 Identity and Services and MS-101 Microsoft 365 Mobility and Security will soon be in beta
No apparent upgrade or transition path/exam is available because existing exams are considered equivalent to an 'associate' level where the new exams are an 'expert' level
New certification roles - Microsoft 365 Enterprise Administrator as well as Modern Desktop Administrator plus an option of Microsoft 365 Certified Fundamentals with more roles to come
No MCSE or MCSA
Content is broader covering all the elements of Microsoft 365 and how they work together