Apple has tapped Academy Award-winner Sam Mendes to direct its TV advertisements for the next-generation iPhone. Citing a trusted source as well as a pair of Twitter updates, Engadget reports that Mendes, who won the Oscar for Best Director in 2000 for American Beauty, will direct the new commercials, at least one of which will feature a mother and daughter have a video chat conversation using the new front-facing camera. Auditions for the commercials…