He will travel to the future in a stargate and become the most renowned electronic bull fighter on Pandora, however, Dr Who will take notice since electronic bull fighting is a sport run entirely by the Hutese mafia. So then he'll show up, along with Amy Pond to fight Gorgonzola the Hut, but they'll find the need an insider in the organization. Harry will end up helping them, and in return the DR will bring them all to a Disaster Area concert to celebrate. They will all, naturally, go deaf, and thus Harry will be forced to retire from his dream job and start a prosperous tribble farm on Thadus.
So, I honestly don't have any unusual expectations for the character. I'm pretty sure that was more or less what Rowling had in mid.