Not to sound mean, but I think it is rather ridiculous of how much attention the new babies of famous people get. But I suppose their first child George was the most special baby in the world, because unlike the children of Hollywood's notables he will probably be King of England one day. Now they are expecting a second child, and while people are excited now, I can expect if it's a boy then he'll probably end rather ignored the older he gets. Especially when it gets more obvious that he won't be King.
Though for the fun of guessing, I'll say the new baby will be a girl.