Google just announced a new family of ad formats called Page-level ads, which it refers to as "AdSense's next generation ads." They're designed to help publishers make money from their mobile content.
To use them, you place the same code once on each page you want to show ads on, and they'll automatically show at the right time and in the right format. Google says this will potentially increase your earnings without interfering with your users' mobile experience.
Product manager Matthew Conroy says, "The benefits of Page-level ads include: optimized ads that show when they’re likely to perform well and provide a good user experience; one-time set-up that only requires you to place the Page-level ad code once on each page you’d like the ads shown; ability to adjust the settings in your account and to enable new ad formats without having to change the code on your site; [and] additional ads on your site that don’t count towards your AdSense per page ad limit."
For now, Page-level ad formats include anchor/overlay and vignette, but more will be available in the near future.
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