Now adsense team team announced Adsense for Feeds globally and to those publishers having a small number of subscribers provided that it is on the approved language for Adsense for Content. Previously on selected countries are allowed to display adsense for feeds but they have rolled it out on all publishers having the condition above.

According to their official announcement.

When you visit the AdSense Setup tab in your account, you’ll notice a new “AdSense for feeds” option. This means you can now use AdSense to place ads in your RSS feeds, allowing you to increase the reach of your content while earning revenue. Our salesforce will sell cost-per-impression (CPM) ads directly to the largest advertisers, while the rest of your inventory will be filled with contextually targeted cost-per-click (CPC) and CPM ads. This means that more of your feed items will be sold and with higher overall revenue, than with any other feed network.

Well you need to manually set it up to migrate your feedburner feed to be manage on your google account.

And here are a few more reasons to try AdSense for feeds:

• Receive higher CPMs and maintain a positive user experience by displaying ads specifically optimized for RSS feeds.
• View detailed stats on your feed audience, distribution, and more through FeedBurner when you set up your feeds with AdSense.
• Manage monetization for your feeds through the same account that you use to manage other AdSense properties.