According to Amazon, The Wrath of the Lich King - which is the next expansion pack - is due to be released the day before his birthday this year.
The Lich King Arthas has set in motion events that could lead to the extinction of all life on Azeroth. With the armies of the undead and the necromantic power of the plague threatening to sweep across the land, only the mightiest heroes can oppose the Lich King's will and end his reign of terror for all time.
That's a shoe in for a present then, including as it does "new hairstyles and dances".
(I was amazed when the Queen's Christmas broadcast notched up a million or so YouTube viewings, but this video showing the origin of Word of Warcraft dances has been watched nearly seven and a half million times. Include me out!)