According to the Telegraph and various other online sources, Matt Smith has recently signed a contract agreeing that he will play the role of The 11th Doctor for a minimum of three years. Most of the articles then go on to say that he will be paid £200,000 for each series he will play The Doctor and that a further two years will be also offered to him as an optional choice to accept or decline. You can view the Telegraph's article about this piece of news here and find other articles here, here and here. Please note that these reports haven't been confirmed and may or may not prove to be true.