Not sure if people have seen this or not - announcement from committee re election of new Pope and potential disruption to the course - was posted on their facebook page today:
PAPAL CONCLAVE: RACECOURSE INFORMATION
The Rome Marathon organizing committee informs all runners that the potential variation of sections of the racecourse depends on the schedule of the Papal Conclave and the consequent decisions of the Prefecture of Rome about public order and security.
Three events may affect the Rome Marathon racecourse: the day of the election itself, the Enthronement of the new Pope and his first Angelus.
The College of Cardinals will meet on March 1.
We have developed several modifications of the racecourse and are ready to implement them should need arise.
We will immediately inform you of any variation that may occur.
None of the Institutions involved has talked about postponing or cancelling the Rome Marathon 2013.