Prince And Princess
William is going to be the heir apparent once his father ascends the throne. This means he will also earn the title Duke of Cornwall. He has actually started to go to duchy meetings in preparation for this. Apart from this, he and Kate are probably going to become the Prince and Princess of Wales.

Prince And Princess
Transition
In November 2018, Royal Central journalist Charlie Proctor said that the plans for the transition are underway. “As per tradition, when Prince Charles does take to the throne, William and Kate will become the Prince and Princess of Wales, meaning he will take on additional duties to assist the monarch,” he expounded. “Just like Prince Charles is preparing to become king, William is already preparing to become Prince of Wales ready for the duties and responsibilities he will have to take on.”

Transition