EON also released a new plot description of the film. Personally, I don't consider things put out officially by the studio to be spoilers, but this description definitely reveals more about the plot than I'd seen anywhere before. (I've been avoiding any information based on the script leaked in the Sony hack.) So bear that in mind if you choose to read further.
A cryptic message from the past sends James Bond on a rogue mission to Mexico City and eventually Rome, where he meets Lucia Sciarra (Monica Bellucci), the beautiful and forbidden widow of an infamous criminal. Bond infiltrates a secret meeting and uncovers the existence of the sinister organisation known as SPECTRE.
Meanwhile back in London, Max Denbigh (Andrew Scott), the new head of the Centre for National Security, questions Bond’s actions and challenges the relevance of MI6, led by M (Ralph Fiennes). Bond covertly enlists Moneypenny (Naomie Harris) and Q (Ben Whishaw) to help him seek out Madeleine Swann (Léa Seydoux), the daughter of his old nemesis Mr White (Jesper Christensen), who may hold the clue to untangling the web of SPECTRE. As the daughter of an assassin, she understands Bond in a way most others cannot.
As Bond ventures towards the heart of SPECTRE, he learns of a chilling connection between himself and the enemy he seeks, played by Christoph Waltz.