Apple's annual developer conference in San Francisco.
New iPod Touch Adds Vibration
Originally discovered on iPod Touch Fans (and also on 9to5), it appears that the new 4th generation iPod Touch actually contains a motor that allows it to vibrate. The motor is shown in the FCC tear down photos of the device.
Apple notes the vibration alert in their iPod Touch Accessibility page:
If somebody wants to start a video call with you, youll receive an invitation -- along with a vibrating alert -- on your iPod touch asking you to join. Simply tap Accept, and the video call begins.Vibration has been an iPhone-only feature since the original launch in 2007. The vibration has been used for silent alerts as well as a form of force-feedback in many iPhone games.