So I believe inline LaTeX images are working in gnus, see here
and immediately below

This turned out to be fairly easy, and didn't require any encoding or
explicit mime function calls.

I've also re-structured the code so that it should be easy to apply the
appropriate mime markup for WL and VM. There are now two mime-library
dependent functions `org-mail-file' and `org-mail-multipart' each of
which contains a `case' block for library-specific behavior, e.g.

(case org-mail-mime-library
  ('mml (format (concat "<#multipart type=alternative><#part type=text/plain>"
                        "%s<#part type=text/html>%s<#/multipart>\n")
                plain html))
  ('semi "?")
  ('vm "?"))

I'd love to hear feedback, suggestions, or expansion of the missing WL
and VM portions of the two functions mentioned above.