I wrote a plugin to output LaTeX and submitted a pull request. Some other ideas for output:

• Pod
  
• Asciidoc
  
• PDF (without needing a LaTeX compiler)
  
• ReStructuredText
  

It seems like you have most of the bases covered, though. In any case, it seems like most people would want Markdown or some other easily readable plaintext format anyway, so you likely don't need all of these output plugins.