Hey, Shuhei Yoshida, when are we going to know the actual PlayStation 4 release date?
"Before it happens," was his response to a fan who asked that exact question. Well played, sir.
In all fairness, if you're going to ask the president of Sony Computer Entertainment Worldwide Studios a question which you know he can't answer, you should expect a troll response.
Currently all we know is that the PS4 is set to release this "holiday season." Rumor has it that it could be out on November 13th, but we also heard that the release date is not set in stone yet. We could hear something at Gamescom, but until then I suggest refraining from asking the Sony boss questions like this.