Progress Status

As there are new confirmed features such as rotator or piston, I think it could be a good idea to post somewhere a "Progress Status" with a percentage showing more or less the development status for some concrete feature. As there are some ideas that are "secret", the progress bars will be shown only for the public features anounced such as "Piston Status: 50% (Buggy but Working)", "Linux Version: 30% (Prepared but something missing)" or "Greenlight Status: 70% (Some more votes needed)" (I don't know if there's a way to know the Greenlight Status)