The relics are held by tradition to be in Cologne, site of the upcoming 20th World Youth Day. Did you know? Here is what JPG said about it.
Also, the process for JPG's beatification opens officially June 28th. The postulator for his cause is asking for the faithful to pray for his intercession (a miracle will be needed before he can be canonized). Here's the prayer:
O Blessed Trinity, We thank you for having graced the Church with Pope John Paul II and for allowing the tenderness of your Fatherly care, the glory of the cross of Christ, and the splendor of the Holy Spirit, to shine through him. Trusting fully in Your infinite mercy and in the maternal intercession of Mary, he has given us a living image of Jesus the Good Shepherd, and has shown us that holiness is the necessary measure of ordinary Christian life and is the way of achieving eternal communion with you. Grant us, by his intercession, and according to Your will, the graces we implore, hoping that he will soon be numbered among your saints. Amen.