According to Film Score Monthly (via Filmonic), composer Alexandre Desplat has been hired on Harry Potter and the Deathly Hallows, Part 1.

Desplat most recently composed the score for The Twilight Saga: New Moon, and was nominated for Oscars for his work on the films The Curious Case of Benjamin Button and The Queen.  He takes over for Nicholas Hooper, who did the previous two Potter flicks.

John Williams, of course, started off the franchise and created that familiar theme, and with Desplat only being hired for the first Deathly Hallows, it’s still possible Williams could return.