TfL have announced that the first route to be run entirely by the New Bus for London (Borisbus) will be route 24 from Pimlico to Hampstead Heath - though no start date has been announced.
http://www.tfl.gov.uk/corporate/media/newscentre/27090.aspx
http://www.tfl.gov.uk/corporate/media/newscentre/27090.aspx