According to the Warner Bros. website, the young actor Dominic McLaughlin has been chosen for the role of Harry Potter. The boy has dark hair and somewhat resembles Daniel Radcliffe. Ron Weasley in the new interpretation of J.K. Rowling's works will be played by a red-haired boy, Alastair Stout. Arabella Stanton was chosen for the role of Hermione. She is likely to receive the most criticism from haters, as aside from her wavy hair, she bears little resemblance to the image of Hermione created in the Potter film series, where she was played by Emma Watson. Arabella is dark-skinned, and her hair is dark.

Source:
HBO