A couple of points should be noted. They were unable to distinguish the effects of caffeinated and decaffeinated coffee, differences in serving size and brew strength. We know that a cup of Sanka might be different than an espresso. Also, all of the studies were performed in white populations.
While it is not the definitive answer, it does help (white) coffee drinkers that drink over three cups a day know that it doesn't increase blood pressure.
(yummy cappuccino from The Steps of Rome, North Beach, San Francisco)