iOS 9 beta secret keyboard for Larger iPad

This could mean apple is working on a bigger ipad, and if so it may be announced with the new iPhone later this year.
It's not uncommon for Apple to prepare for new devices this way: the beta for iOS 6 scaled up to fit the 4-inch display of the iPhone 5 before it was announced, and hints of the iPhone 6's larger display were scattered throughout the iOS 8 beta as well. This is perhaps unintentional, but it also seems unlikely that Apple would mind developers being aware of what's coming down the road