Full release notes will be available when 4.1 has been released.
For now you can check out the release notes for the individual milestones:

- https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.1.0-M2-Release-Notes[v4.1.0-M2]
- https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.1.0-M1-Release-Notes[v4.1.0-M1]
