How much Google keeps from Adsense revenue?

As per the Google Adsense blog Announcement, google revealed the Adsense Share that it keeps from Ads displayed in websites.

1. For Adsense for Content, Google pays 68% of revenue to publisher and google takes the rest.
2. For Adsense for Search, Google pays 51% of revenue to Publisher and google takes the rest.

For other types of Adsense ads like Mobile Adsense, Adsense for Feeds, and Adsense for Games, Google has not declared the revenue share. Google says:

"We aren’t disclosing the revenue shares for these products at this time because they’re quickly evolving, and we're still learning about the costs associated with supporting them. Revenue shares for these products can vary from product to product since our costs in building and maintaining these products can vary significantly."