If you've been using your iPad's orientation lock regularly, it's time to start weaning yourself from it. After updating to iOS 4.0.2, the toggle will become a mute switch instead. When the iPad was first announced, the switch was intended to mute your tablet (similar to the iPhone's), but when the iPad was released in March, the switch functioned as a lock to maintain the orientation of content no matter which direction you turned it.
Since the change in function will completely take away the option to lock the iPad's screen, some wondered if users would be given the chance to choose between two options. Not so, according to Steve Jobs via an email response to an iPad user.