Kensington Palace formally announced this morning that the Duke of Cambridge, 32, will travel abroad in early 2015 at the request of Her Majesty's Government.
A visit to China had been widely rumoured but the addition of Japan to the schedule is a surprise.
William will depart for Japan at the end of February, spending three days in the country before leaving for China, which will involve another three days of engagements. He will return to the UK in early March.
While in Japan, the duke will be based in Tokyo, where he'll take part in engagements focused on UK-Japan relations, commerce and cultural exchange, as well as promoting his own stance on illegal wildlife trade.
In China, he will visit Shanghai and Beijing for similar engagements.
Kensington Palace did not name the Duchess of Cambridge in its press release, suggesting she will remain at home in the UK. That's not unexpected as she will be nearing the end of her pregnancy at the time of the travel.
William and Kate are expecting their second child in April.
Earlier this week, the duchess undertook an engagement in Norwich in aid of East Anglia Children's Hospices, of which she is a patron. She looked beautiful in red while visiting Norfolk Showgrounds to launch a £10 million charity appeal.
Kate, 33, has been gradually resuming public appearances following a difficult start to her pregnancy.
As happened with Prince George, now one, the duchess has been diagnosed with hyperemesis gravidarum, a severe form of pregnancy sickness. It forced her to cancel several engagements towards the end of the summer while she received medical treatment .
However, she's now on the mend and feeling well enough to accompany William to the US next month for an official visit. Kate will remain in New York for their whirlwind trip while William will also travel to Washington DC.
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