Google Adwords Changes the Size of Fonts

Not sure if anyone's noticed but it would look like Google has changed the size of the 'headline' font for their Google Adwords. I think this happened over the last couple of days. Google Adsense publishers should pay attention and adjust their adverts accordingly. I would say that this obviously means that Google will generate more revenue with larger font sizes or am I being cynical and it is actually designed to aid usability!