We didn't get a ton of details on this one during the keynote, but Apple has announced a new Guided Access feature for iOS that promises to let folks limit what sort of input their devices are able to respond to. Some examples given by Apple are a parent of an autistic child who could disable on-screen controls so they don't accidentally exit an app, a teacher who could prevent students from exiting a test app, or museums who could keep folks locked in to their own display apps. That includes the ability to confine touch input to certain parts of the screen, in addition to disabling the home button or touch input altogether.
http://www.engadget.com/2012/06/11/a...nded-accessib/