And based on further feedback, the Post-…

And based on further feedback, the Post-Format related Guidelines have been changed again. To summarize:

  • Post Formats
    • Themes may optionally support Post Formats, including any, all, or none of the Post Format types.
    • Unless an extension APIAPI An API or Application Programming Interface is a software intermediary that allows programs to interact with each other and share data in limited, clearly defined ways. is implemented in coreCore Core is the set of software required to run WordPress. The Core Development Team builds WordPress., Themes are required not to implement a custom extension for Post Format types (e.g. “hacking” the core Post Format type list to add custom types, such as “code”).