Rhonin the wizard on 07 November 2011
The files have been datamined and a script has been found out about the story. Look here, keep in mind that the data is old and changes can happen before the game is released.
Here is Bioware's response to the leak:
"Hey Everyone!
We are still investigating, but it appears that some internal story files have been leaked. Even though the information in those files is out of date and does not reflect the final story experience, we urge fans not to read them if they want to experience the purest form of the story in Mass Effect 3.
-Jess"
