This is the staging directory. The shapes in this directory are not released as part of the public Calligra releases and can be developed on their own pace.
This should be the starting point for all new shapes that aspire to become part of the Calligra source code. When the shape is working well, put a review up at reviewboard.kde.org and after the review is passed it can be moved to the parent directory. After this, the shape is officially part of the Calligra suite.