What happened to the Markdown standardization effort?

Almost a year and a half ago Jeff Atwood proposed a Markdown standardization effort: http://blog.codinghorror.com/the-future-of-markdown/). The popular Markdown parser Sundown was subsequently deprecated in antipication of this effort (https://github.com/vmg/sundown/commit/37728fb2d7137ff7c37d0a474cb827a8d6d846d8) and has not been updated since.

What happened to this effort? It seems implausible to me that it could take a year and a half. Did it fall apart?