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Regarding the first question, passing AZ-204 before it retires on July 31, 2026, permanently fulfills the prerequisite requirement for AZ-400. Once you earn your badge, Microsoft recognizes it for this expert certification path.
More at https://learn.microsoft.com/en-ie/answers/questions/2259640/devops-expert-certificate-eligibility
As far as the second goes, as per [https://learn.microsoft.com/en-au/answers/questions/5852510/prerequisite-for-the-devops-engineer-expert-(az-40](https://learn.microsoft.com/en-au/answers/questions/5852510/prerequisite-for-the-devops-engineer-expert-(az-40)
AI-200 will be added as one of the prerequisites for DevOps Engineer Expert once the exam becomes generally available.
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hth
Marcin