While the mystery behind JJ Abrams and Steven Spielberg's throwback sci-fi with a heart epic "Super 8" is a very important part of its charm, the marketing behind another legend-packed big screen blockbuster has been surprisingly frank. After all, the entire plot is in the title.In Harrison Ford (Han Solo, Indiana Jones) and Daniel Craig (James Bond), the upcoming "Cowboys & Aliens," stars two generations of action legends, and makes sure to emphasize that fact in its posters, trailers and other hype-up materials.