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This blog post and comments answers your questions
and this reply in particular
AI-200 focuses on the skills developers need to deliver solutions on Azure with demanding performance and responsiveness requirements. The course covers similar ground as AZ-204, but with a greater focus on code and observability. The certification will let developers show they can deliver solutions on Azure with a variety of architectural requirements.
AI-200 Developing AI Cloud Solutions on Azure is the replacement for AZ-204
There is a fair amount of overlap between AZ-204 and AI-200 but with greater emphasis on using AI when building solutions
When the Microsoft Certified: Azure Developer Associate certification after AZ-204 retires at the end of July it will not be able to be renewed and your certification will be moved to the Historical certifications when it reaches its expiration date .
As the post says, you should prepare for AI-200. There will be no general Azure application development exams - all the focus of new exams/certifications is on agentic AI.