"if he knows that his nose will not grow when he says my nose will grow then he knows he is lieing and his nose will grow, in which case he knows that his nose would grow which would make the statement fact, so we must conclude that pincochio does not know the state of his own nose. " -http://gemssty.com/2009/03/01/pinocchio-paradox/

Perhaps it is not possible to lie about ignorance. Lying requires information and to give false information. Proceeding Pinocchio's declaration, Pinocchio will learn if his assessment was correct or not, but not before.
If my theory is correct, nothing will happen to Pinocchio's nose. Pinocchio will just look stupid and stupidity isn't the same as lying.