The UBL revision history (appendix C) traditionally contains a section for each minor version stating the new document types that were added. For UBL 2.5 that would be section C.8.1.

Need to update this section to mention that new document types in 2.5 (once known).

Alternatively, since the focus of 2.5 has been to enhance interoperability and quality, adding a JSON syntax binding, etc., we could talk about the changes and improvements instead of new document types.