Each time Apple releases a new operating system, or new product, they publish a digital support manual for that device relative to the newest version of iOS or OS X. When “the new iPad” was released on March 15th, Apple published the user guide. Ditto for the iPhone 5. And each time a new version of iOS comes out, those guides are updated and published again.
All Apple user guides are up-to-date, except the iPad user guide, which hasn’t been touched since March. Some eagle-eyed observers have wondered why a month has passed since iOS 6’s release without Apple updating it, and it’s probably because Apple’s waiting for the iPad Mini keynote.