I could sort of understand the secrecy regarding the pick up location in Paris as this was supposedly done under the guise of a high terrorist alert (although the concept of having the largest group of people gathered in a confined area immediately prior to the x-ray and security checks, did defy logic).
So why the continued secrecy through in Madrid?
This draw was made over 2 weeks ago and most fans have been making travel arrangements ever since. The location of the airport and ground won't change but the collection point may influence where people chose to stay.