[NTG-context] Current status of epub export and documentation

Hi all, I am interested in the epub export feature of ConTeXt/MKIV. There are a some hints in epub-mkiv-demo.tex epub-mkiv.pdf http://wiki.contextgarden.net/ePub I am looking for a more detailed example (or documentation) to learn what is possible and what not. (Eg. \showsetup{command-name} is not exported to epub) Does anybody already made a full validated epub ebook with ConTeXt including cover, titlepage, appendix etc. ? Is there more information about the current status of the export feature? A release schedule or roadmap? Background of my question is that I am looking for a single source publishing tool for printed books and ebooks. TIA juh