In a recent interview with Empireonline.com Christopher Lee, the man behind Saruman in the Lord of the Rings trilogy admitted that no new negotiations have been made as of yet for his reprisal as Saruman in the two upcoming Hobbit movies to be helmed by Guillermo del Toro but that if asked he would be more than happy to come back!
"No, I haven’t heard anything (On the question of del Toro asking you to come back to the role of Saruman). Only on the fan forums and websites, but I’d be happy to. I could be the voice of Smaug."
Even though the role would be a rather small one if to take on Saruman again, I believe it would put us all at ease if we saw another familiar face from the trilogy coming back to these movies!