Life science research runs slowly. It's darkly funny to expect any meaningful update a year after something is published. Raising grants for step two can take a year, or several years if yours is not a very hot topic indeed, animal studies can take a couple of years, and so the iterative loop is not particularly short.

If you're not involved, it makes sense to check every five years or so on any particular thread in early stage medical research.

The first author of that paper did an AMA on reddit.com/r/science that you may find interesting as an update on where things stand: http://www.reddit.com/r/science/comments/2tykiu/