Here is part of the announcement that was published by the Archdiocese of Berlin earlier today (my translation, with help from Google Translate): -
Pope Benedict XVI will celebrate the Eucharist on the first day of his visit to Germany, 22 September 2011, at the Olympic Stadium in Berlin.To read the statement in full, please see the website for the Archdiocese of Berlin. To read one of the first reports on this story in the world press, please see the Telegraph's piece, entitled "Pope's Berlin Mass moved to Nazi Olympic site."
"So many people want to celebrate Holy Mass with the Pope that the front of the Charlottenburg Palace would be bursting at the seams," said Diocesan Administrator Bishop Dr Matthias Heinrich. "It is greatly encouraging for the faithful in the Archdiocese of Berlin that so many people from across Germany and beyond have registered to attend the service."
"We already have nearly 50,000 applications," added Monsignor Ronald Rother, who is responsible for the preparation of the Pope's visit to the Archdiocese of Berlin. He also renewed the invitation to join the event, saying, "It is still possible to register via www.papst-in-deutschland.de and by signing applications within the parishes of the Archdiocese of Berlin. "
"This decision ensures that we can consider all applications," said the general coordinator of the Pope's trip, Fr Hans Langendörfer SJ. "Many have good memories of attending Mass celebrated by Pope John Paul II in 1996." The Olympic Stadium in Berlin is barrier free and offers proven safety measures, it is also equipped with seats, many of which are covered. "This will just help older people to be able to attend the Papal Mass," said Langendörfer.
The transfer of the Papal Mass to the Olympic Stadium was agreed between the Vatican, the German Bishops' Conference and the Archdiocese of Berlin.