I'm not 100% sure about this. I know Disney like to leak things, but having reviewed every inch of these drawings and all of the narratives, they did a remarkable job of disguising the identity of the end product. There's not one word in any of these documents that would lead anyone to firmly say these are for Avatar. They depict a ride facility and descriptions of other components of a new land, but the theme could be anything - just re-purpose the drawings and apply a completely different theme/franchise/story.
I think these were really meant to stay fairly confidential. They had to take the risk of giving them to hand selected contractors so they could get real life budget numbers, but I bet those contractors signed some serious confidentiality statements too.