As notes MacRumors [1], according to an interview [2] of Errol Morris, which had shot the Apple switch campaign ads, Apple is working on new ads promoting the Macintosh.
The particularity of these new ads is that they're shot will be shot in an "Ames Room [3]".
Additionally, last week, Apple has silently released through iTunes' Music videos section, a new Apple iTunes/iPod ad featuring Coldplay.