According to an interview with Radio Times, Radcliffe said that while he has ** plans regarding wizardry or the acting out of it, he doesn't want to write off a return to Harry Potter completely.
“It would depend on the script,” Radcliffe said. “The circumstances would have to be pretty extraordinary. But then I am sure Harrison Ford said that with Han Solo and look what happened there! So I am saying, ‘**,’ for **w but leaving room to backtrack in the future.” Read more...