Apple's annual developer conference in San Francisco.
Apple Prepping 'Explicit' Category for App Store
MacStories.net has discovered two new categories in iTunes that are currently unpopulated: Top Explicit Paid Software and Top Explicit iPad Software (iTunes links). The new categories confirm previous reports that Apple was working on adding such a category to iTunes.
The move appears to reverse a recent policy shift of Apple's to remove all sexually suggestive materials from the App Store. Those removals were reportedly secondary to customer complaints about the growing number of such apps.
It's not clear when (or even if) Apple will launch the new category of Apps.