Trump isn't in power yet. The noises he's making now show he knows the convention of what the president elect says in the transition period. In a way his chameleon character in the last couple of days is more disconcerting than if he had just stayed the same.
The real test comes in how he reacts when journalists write things about him he doesn't like. And when other politicians and foreign leaders frustrate his plans. His track record of tolerating others and accepting limits and codes of conduct is extremely poor.