I sometimes wonder how it is possible to stop ones enemies from knowing what the capabilities of some aircraft are. There seems to be so much public domain knowledge. I presume that you want them to believe it's either better or worse than it really is so that their planning cannot cater for it adequately. If I was in charge of this now, I'd want to create lots of doubt in every direction - confusing comparisons of price and performance which don't add up. At the same time one must convince the public that their money isn't being wasted. Seems like a very difficult job to me.
Another thought that struck me was that it's great to have a big, late, wildly overbudget programme in which one might be able to hide spending that's really aimed at something else. Not that I'm suggesting this is the case now - I just can't help but think it.