Comic-Con 2009 Preview: 'New Moon,' 'Iron Man 2' And More We give you a rundown of what to expect at the year's biggest and best pop-culture fest! Every summer, the Hollywood Santa leaves the North Pole for San Diego. He slips down the Convention Center chimney for four very special days, leaving good geeks exclusive treats, never-before-seen footage and movie-star encounters. They call it Comic…