As announced on the Picviz mailing list, the new GUI is out. This is not a new release of the engine (libpicviz) but the GUI.
There is a lot of new feature that came from the Google summer of code, since Picviz was a project proposed by the Honeynet project. It is mostly about interaction that a graphical interface can give you to deal with parallel coordinates.
You can download it there: http://www.wallinfire.net/files/picviz