On the Apple Support Site it says to go to the bookmark in Safari for the iOS 6 guide. However when I went there and clicked the bookmark I got the guide for iOS 5.1. Seems strange to me that the guide is not available.
My apologies. Found this thread through search, so I didn't notice that it was in regards to iPad. That manual is not yet available, however, based upon the corresponding iPhone manual having been released, I would assume it will come shortly.