This is a trend that I have personally witnessed since joining the corporate workforce as a recent college graduate living in a major city.
In general I saw my female colleagues getting promoted faster and moving up faster than their male counterparts.
In no way do I think it was favouritism, I just believe our senior management thought these young women were better prepared and organised than their male counterpart in their 20's.
Whether or not this trend continues to higher levels of management remains to be seen.