A feature article on the banquet to celebrate Macbeth's investiture might be interesting. You would have to think of a tactical reason why Macbeth's behaviour is a little odd (after seeing Banquo's ghost).
How about an exclusive interview with Lady Macbeth -- the "Power Behind the Throne?" Makes for an old-time newspaper byline, at least. You could query her on her actions and ask about her motives.
You could be a Scottish newspaper editor who is criticizing the way that the country is being run under Macbeth's rule. Or you could be a reporter and you could report on the battle at the beginning of the play. Or maybe you could be a gossip columnist and write snide articles about rumors that Macbeth thinks he's been talking to fortune-telling witches.