A story at Cinescape.com indicates that Chris Columbus will not be directing the third film in the Harry Potter series. They indicate he's returning to the States for family reasons after finishing HP2. Cinescape suggests that Alfonso Cuaron of Y Tu Mama Tambien is the leading candidate, however unlikely that seems. I seem to remember Stephen Speilberg indicating that he'd like to direct the THIRD Harry Potter picture specifically. Perhaps he'll get his chance.