For whatever reason they leaked, I doubt the CEO of a high profile company would acknowledge a slip up in the company's security efforts. Steve would basically be taking a shot at his own company if he joked about the leak or even acknowledged it.
Steve will get up there, and present the new iPhone as if nothing happened. Do you think they'd honestly want to draw even more attention to these security breaches?
You obviously didn't see the keynote when he introduced the Power Mac G5 after the specs had been leaked on Apple's own website...