Daniel Craig Unsure About James Bond Future

Daniel Craig has admitted that he doesn't know how much longer he'll be playing James Bond.

The British actor took over from Pierce Brosnan in 2006's Casino Royale, reprised the role in 2008 with Quantum of Solace, and is signed on to film two more Bond films after the latest film, currently known as Bond 23, wraps.

Financial problems within MGM meant that Sony bought the rights to the classic spy series earlier this year, but with Bond 23 not being released until October 2012, estimates suggest that the 25th Bond installment might not be made until 2020, by which time Craig would be 52.

As a result, Craig told MTV News that he wouldn't be surprised if the latest 007 outing turned out to be his last.

Bond 23 will be directed by Sam Mendes, with Javier Bardem taking on the role of the villain.

Adele will contribute the theme tune.

 Fifty years of Bond theme tunes...