Google has overhauled the ad creation process and interface in AdSense to make it easier to set up and deploy new ads across your site.
When modifying text ad styles, a preview will show how each change affects the look of the ad, including font style, color and size. Once you’ve made changes to an ad unit, they can be implemented across an entire site rather than at the ad unit level.
The last update announced is a subtle one. The display URL on the default ad setting will now be light gray instead of green.