Naomie Harris has reportedly been told told that she'll have to change her voice for her role in the next James Bond installment, titled Skyfall; a role that may or may not be Moneypenny so far it's been described as "a field agent called Eve," though some claim that Eve eventually becomes Moneypenny? I'm not intimately familiar with James Bond lore, and I couldn't find anything confirming that as fact, so I can't say whether or not "Eve" is a precursor to Monyepenny. Besides, I'd rather see Naomie kicking arse and firing weapons than sitting behind a desk, flirting with 007.
Anywho... yes, word from some UK papers is that the film's producers feel that her natural voice is too high-pitched, and they prefer that it be more husky, going for something sexier and more "womanly." After all, she is in a James Bond movie, where the women he beds are usually sexy and womanly :)
In addition, the 35-year-old actress, who expressed her love for Grace Jones' performance in A View to a Kill, has been actively prepping for the roles which will apparently require that she be ready to be just as dynamic as Jones' *Bond Girl* characterization was.