My take is Apple does not like the fact developers are still making money off applications that are free. Apple gets no cut of an application sold for $0 in iTunes yet developers are raking in some revenue via ad placement. Plus to piss off Steve Jobs worse many ads in applications are served by Google, so Google is making a cut off an application given away free in the iTunes store but Apple gets nothing.
To rectify that situation, considering Apple's need to control everything and squeeze every penny from each Apple user, I can totally see Apple doing the following:
-All ads in applications from third parties such as Google are banned.
-In order to place ads in an application, you must use Apple's "Revolutionary Ad Placement and Targeting Experience". The updated SDK will make this "a breeze for developers to implement"
-Apple will take 30% of revenues earned via mobile advertising, and you get 70%. Somebody has to pay for the servers throwing up ads after all.
It will be a market place where advertisers buy space in Apple's world and Apple throws up the ads in an intelligent way. It will be in direct competition with and work very similar to Google's advertising method.