Actually, royal reporter Richard Palmer has stated that William will start performing Investitures on behalf of The Queen for the first time-
Preparing to be King: Prince William says goodbye to RAF after more than seven years | UK | News | Daily Express
That means squat, he doesn't get his information from the palace. If you read the article, and then read the equivalent Daily Mail article you will discover they read the exact same with a few words changed.
Express =
He will be undertaking a wider variety of royal engagements, however, including a couple of investitures on behalf of the Queen for the first time.
DailyMail =
He will also start to work alongside the Queen and may even stand in for his grandmother at events such as investitures.
Express =
William, the Duke of Cambridge, also intends to spend time learning more about his father's hereditary landed estate, the Duchy of Cornwall, which he will one day inherit. He is then expected to undertake
a two to three year role in public service, possibly working for a Government department such as the Foreign Office or in a civilian role in the Ministry of Defence.
DailyMail =
The 31-year-old will undertake a series of work experience-style placements in everything from government departments to charity offices.
Although an announcement about his future plans had long been anticipated because his tour of duty in Anglesey was always going to end this month, it had been widely assumed he would sign up for another
two or three years in the military.
My bolding, I think someone at the Express has mis-read.
Express -
Instead he plans to spend the time he would have devoted to military duties on high-profile projects, including campaigning against poaching and the illegal trade in wildlife products, over the next 12 months in what Kensington Palace called "a transitional year".
DailyMail -
William also wishes to expand the work of his charitable foundation and develop a high-profile role in championing the conservation of endangered species. He will now embark on what aides describe as a transitional year-long programme of public service as he prepares to become a full-time working royal.
They copy each other.