In Skyfall, Bond's loyalty to M is tested as her past comes back to haunt her. As MI6 comes under attack, 007 must track down and destroy the threat, no matter how personal the cost. -- (C) Official Site
In attempting to pilot the franchise backward and forward simultaneously, the filmmakers have delivered the most unusual Bond film since the truly great (and truly bonkers) On Her Majesty's Secret Service in 1969.
Skyfall has fun playing with Bond's image, but the producers are wary of being too revisionistic. In fact, the film is good because it's such a stirring affirmation of the things 007 films have always done well.