The Hobbit: An Unexpected Journey (Guillermo Del Toro version)

The Hobbit: An Unexpected Journey was gonna be directed by Guillermo Del Toro until he dropped out of the project.

Results

 * 1) The Guillermo Del Toro version was cancelled.
 * 2) Peter Jackson ended up directing The Hobbit: An Unexpected Journey.
 * 3) Guillermo Del Toro later directed the 2013 film Pacific Rim.