Not exactly...........I would think that it would be prudent to have something to show in order to line things up.  Whether  some photos of something preliminary..or other....don't care.  The more interest you create......the more bank you make....refer to the blog:

"We have significant interest in these systems from both military/government and commercial customers. "

I would rather have people lining up with the intention of getting something before others..."head of the line"