A big part of PivotX has been documented but we are not there yet. But you don't have to worry, the basics are very much covered and PivotX isn't difficult to work with. If you have questions that are (yet) undocumented please visit the support forum. If you can't find your answer there don't hesitate to ask the community.
From now on you can find the complete documentation on Book.PivotX.net. The document will be updated everyday.