Google AdSense is soon launching Code Free Ad Changes
The Inside AdSense blog announced that they will be releasing a new ad management solution to enable code-free ad changes.
Currently, if you want to change your AdSense layout to a different color, format, channel or whatever, after you make that change in the AdSense console, you need to copy and paste new AdSense code into your site. In the future, all you will need to do is make the change in the AdSense console and the changes will be automatically applied to your live ads.
This can be a huge time saver for many AdSense publishers. It is currently not live but Google promises to roll it out to publishers over the "next few weeks.