We could have a director for Bond 24, and his name is Christopher Nolan.
Actually, I am jumping the gun a bit here, but The Daily Mail(by way of Super Hero Hype) is reporting that EON has entered informal talks with the Dark Knight director to direct Bond 24. Previous reports have indicated that the screenplay is currently being worked on and that MGM is hoping for a release in the next three years, or 2016.
If Nolan is indeed selected as the director, a scheduling conflict may occur. Nolan is currently working on Interstellar, which should hit theaters November 7, 2014, however he is known to churn out big projects in less than two years, so that 2016 date is still viable.
Nolan is an outspoken fan of James Bond, and has gone on record that he wanted to direct one of his films in the past, but until anything solid comes forth, consider this as rumor for now.