Yes, I didn’t believe it was true but according to wikipedia it is:
In a recent audio interview with conservative speaker, Dan Flynn, Warrior revealed that he will be publishing two books in 2007. The first being a strictly ideological work on the core conservative values, and their function in a modern society. Although as yet officially untitled, Warrior hopes the work will be released as America: Get It or Get Out; but the release date of the book is unknown.
Edit: I must say that I posted this because I was a HUGE WWF fan at the time that the Ultimate Warrior was popular.