Thank you ghost night for the article. Will be nice to see William and Catherine in the carriage with the Queen and Duke. As for the Easter discussion, I think it might be getting a little heated. Lets all breathe.
The Duke and Duchess won't be in the carriage with the Queen and Duke, they will be in the procession - along with the Prince of Wales and Duchess of Cornwall and Prince Harry. I'd say possibly Andrew and his girls, Anne and Tim and Edward and Sophie will also be in the carriage procession.
If anyone were to ride in the carriage with the Queen and Prince Philip it would be Charles and Camilla as the next in line.
It's just a poorly phrased article and headline to work William and Kate into a story about the Queen and Duke.