As picked up by Aidan, a Culture movie could be in the works. Director Dominic Murphy is attached to an adaptation of Iain M. Banks' short story 'A Gift from the Culture', which appears in the collection The State of the Art.
I'm going to hazard a guess that the story, which is really short, and would probably take less than twenty minutes to tell on screen as is, is going to be used as a jumping-off point for a story that is mostly original material, but still utilising the Culture backdrop. This could be an interesting move, certainly more viable than cramming one of Banks' larger 400-page novels into less than two hours, and probably much cheaper as well. Consider Phlebas, the logical starting place for a Culture adaptation, would require a special effects budget that would probably give Michael Bay pause, so testing the waters with a smaller story could be a good move.
Whether they maintain the central concept of the premise - a female Culture citizens goes native on a primitive planet in a male body but is blackmailed into operating a Culture weapon lest harm come to her/his boyfriend - is also another question. Such questions about gender and identity in the face of (relatively) easy sex-changing technology are the bread and butter of hard SF, but could make movie companies uneasy, especially if it does become a larger-budget production.
Still, an interesting idea at any rate. We'll have to wait and see if anything comes of it.