I sympathize with the filmmakers wanting to not give away their entire story before the film is even made.  They seem to be caught in a very hard-to-escape-from trap.
They may have to compromise at least a little and give more detailed spoilers to spark funding (as several others have said).
	
		
			
		
		
	
				
			They may have to compromise at least a little and give more detailed spoilers to spark funding (as several others have said).
				