Clearly they've chosen to go with young, unknown faces - only three of the five have an IMDB page at all - and to ignore the books' description in terms of ethnic background, as only two of the five are white. They do each look the part in the pictures, they did a pretty nice job photographing each actor in a way that makes them look believable as the character. We'll have to see how it works out, but looks good to me so far.