This is a hard question.
We are waiting to finish a big documentation rewriting, which is about
60%, before the public release.
It will be published with this updated documentation in a few month, but
I am not able to tell when. Should be in 2010.
Note that customers -who don't need documentation that much because they
had a training and work with us- have access to this release, if this
was the question. (The intent is not to provide a premium access for
customer, but to provide a quality documented software to the community,
on which they are independant)