FYI - The recently released Domino 14.5.1 EA1 build also includes a preview version of the upcoming HCL Sametime 12.0.4 chat-only server. You can find the install packages for Windows and for Docker / K8s in the “Notes 14.5.1 EA1” subfolder: My HCLSoftware
The Sametime product documentation has not yet been updated for 12.0.4. However, you can refer to the existing ST 12.0.3 documentation when you install the new builds.
Give the new version a try and don’t forget to share your feedback either in the early access forum or here.