From the WYD site:
The Icon of our Lady
On Palm Sunday in 2003, the Pope introduced a new element for WYD: from then on, the WYD Cross would be accompanied on its pilgrimage by the Icon of Our Lady , Salus Populi Romani.
“Today I also entrust to the delegation from Germany the Icon of Mary. From now on it will accompany the World Youth Days, together with the Cross. Behold, your Mother! It will be a sign of Mary’s motherly presence close to young people who are called, like the Apostle John, to welcome her into their lives.” (Angelus, 18th World Youth Day, 13 April 2003).
This icon , a copy of a venerated icon in Santa Maria Maggiore in Rome, was present at the Vigil and Papal Mass of WYD 2000 in Tor Vergata in Rome.
This seems to me a striking visual statement that within Roman Catholicism, the cross of Christ is not a sufficient basis for our relationship with God.
I don’t think we ought to endorse such a statement in any way. But we can constructively ask how WYD will provide an opportunity for us to talk about salvation by grace, through faith alone and Christ alone. We might also ask more specifically how we can use WYD as a basis for talking to our Roman Catholic friends about the truth of the gospel.
In a stunning departure from normal procedure, I’m going to discipline myself in the context of this discussion to observe normal rules of courtesy. [Michael Jensen, read and wonder! ;-)]. I have some dear Roman Catholic friends and I really hope that WYD will be the beginning of some conversations (with them and others) about the uniqueness of Christ and the sufficiency of his salvation—rather than the end.
The danger of a conciliatory approach like this is that it lends milage and comfort to those who want to see something like the role of Mary in salvation as a peripheral issue on which Christians can differ, which is absolutely not the case. The power of a conciliatory approach, although it is not the only gospel-minded approach, is that it keeps discussion going with our Roman Catholic friends.
Remember that the current Pope, for his part, views any expression of biblical faith as deficient and regards Protestant Christians as people who need to be evangelized accordingly. Otherwise he would not have added the icon of Mary to this procession.