I think they might be off on the actual date, but they'll definitely start showing more things sooner or later. Come to think of it, part of the secretive attitude is due to uncertainty of what will be in the final product and part of it is due to other flight sims and how they might compare.
As for the first one, in the SimHQ interview Maddox said that all that's left to do is finalize some of the aircraft models and the ships, so it's pretty much a done deal as to what will be inlcuded. As for the "competition", this has also been revealed. True, other modern sims might focuse on different eras and they are not exactly competing products, but everyone wants his sim to look like it's ahead of the rest regardless. Well, Black Shark is about to get the A-10 addon, RoF has been released and MS closed down their Aces studio, so there's not really any mystery surrounding this aspect either.
I guess that leading up to winter we'll start seeing what all is really about.