A new book by the Chilean UN official who headed an investigative commission in Ms Bhutto's death is out. In a Foreign Policy article, based on the book, the author ends with:
...most Pakistani political actors would rather turn the page than continue investigating who was behind her assassination. Probably no government or court of law will be able or willing to fully disentangle the whole truth from that web. It may well be that Bhutto’s assassination will be another unsolved case in the long history of impunity in Pakistan, and that the controversy surrounding her assassination will endure as much as her memory.
Link to article:http://www.foreignaffairs.com/articl...rder?page=show

Now of course there are the headlines 'Musharraf indicted for murder of Benazir Bhutto':http://www.bbc.co.uk/news/world-asia-23763895