Based on what you have said (mostly your comment about needing twice as much fuel as expected) sounds like fuel range is one concern for me. I recently bought an aux tank for my WR450F which would bring me to 23L. Does that sound like it should be doable given the distances/terrain you are planning?
Beyond that I am finding answers to all my big questions on the website... well other than entry fee but I suspect lots of unknowns before you are able to set that.
As far as course details I agree, keep is secret, much more of an adventure knot knowing exactly what is in store