Skyfall screenwriters Neal Purvis and Robert Wade, who have confirmed they are leaving the series after the success of the current film, have said that John Logan and Sam Mendes have a plot for Bond 24.
An article in Total Film speculates that this might mean Mendes comes back for another film. The pair also tell of how they thought about quitting the Bond series after Quantum of Solace. In total they wrote the screenplays for five 007 films.
Mendes is a friend to Daniel Craig and got job in casual chat with him, they say. Neat.