I was generating code for my new site and saw this new feature. After Selecting Channel, there is now a new thing called Ad Unit Name. Now, you can give a name to your adblock and it will appear in your ads. You can also remove it. (Good for us ) There is a new tab called Manage Ads, IMO, adsense store the adcode in their server and server the ads directly from there. The ad code is a bot different. No custom colors or Changed made can noyt seen any more. You can now edit the ad unit in your control panel and the changes will take effect without putting the modified code back to your site.