CyclingNews published a gallery of photos of the Astana team getting tested for bike position by Specialized. Of particular interest was the position changes given to Viscenzo Nibali, their new star for stage races, who rode for the Cannondale-sponsored team last year. Presumibly the superior fit provided by the Specialized crew led by Andy Pruitt would improve Nibali's time trialing.
I was curious in how the position change, so I superposed the before and after photos in the article. To align the photos, I rotated and scaled them to align the arm pads.
According to the article, "Nibali's bars were raised so he could try to relax his shoulders and drop his head". However, to me if anything his "before" shot looks more relaxed, with a lower head and a more aerodynamic position. If on top of this you shift his "after" position up (the bars being higher) the advantage of the before shot appears even greater.
Of course, there's always the possibility the new position produces more power. Or there's the very real possibility the new position isn't well represented by the photo, which is just a moment in time.