The story the BBC covered on Greece's national deficit has been updated multiple times over the last few weeks. (http://news.bbc.co.uk/2/hi/europe/8456216.stm)
The updates have primarily been with the gain of more information.
As the meetings of EU summits investigate the deficit in Greece, the issue seems to get increasingly complicated. The updates of the news story has the effect of a play-by-play, allowing its audience to get the last statements by officials and the most recent attempts of solve the issue.
Though there are, most definitely , other new stories that answer questions or shed light on 'mysteries' of a story. This story only updates the development of a debate.