I think Brian's post below suggests that such documentation is unlikely to be provided...why spend the time writing it up for external consumption if it isn't going to be supported? The documentation group is already having trouble keeping up with the developers! A focused question or two on the forum might get answered, but "tell me everything I might want to know" I think requires waiting for a disaffected Omni employee to send something to Wikileaks :-)
http://forums.omnigroup.com/showpost.php?p=86874