It is still very early and it will be a long time before anyone will know what happened with Air France flight 447. Due to the nature of the area where the plane went down, we may never know what happened.
With that being said, I found an interesting person that has gathered a great deal of information related to weather and routing that makes interesting reading for pilots. It is also something that we could spend a whole afternoon studying.
Here is the link to Tim Vasquez's detailed work about AF447: