Same thing was said of William. Their Queen hasn’t said who will be king.
She doesn't have to - and in fact she can't. The law of succession is not in the Queen's control. She doesn't say who becomes King after her - the line of succession is set by Acts of Parliament.
If he had had the power, King George V, would have probably stopped his son Edward becoming King. As it was, Edward did become King, even if circumstances did eventually lead to his abdication.