Perhaps you hold your photographic future project cards close to your chest for the same reasons you became a biologist, because it's just the way you're made up. Maybe it's not so much having people scoop your ideas than you don't want anybody to see it until you've carefully researched, carefully completed, and come to a satisfying end to the project. Then again...
As for me? I tend to not work on projects but will try to empty myself of any preconceptions before setting out, open myself to the essence of an area, and will try to photograph more as a conduit - a 'spirit of place' documentary photographer for lack of a better description.
Later, if a project comes to mind, I'll go through my negatives and find the sequence of images that best fit the bill. I'm working on one right now...and NO I will NOT tell you what it is because you're just up the coast from me and it's such a kick-ass great idea I know you'll scoot down here, scoop me, and sail off into the sunset on the winds of fame and glory