The Vatican's Congregation for the Doctrine of the Faith has published new instructions regarding burials and the conservation of ashes.
"Following the most ancient Christian tradition, the Church insistently recommends that the bodies of the deceased be buried in cemeteries or other sacred places.
In memory of the death, burial and resurrection of the Lord, the mystery that illumines the Christian meaning of death, burial is above all the most fitting way to express faith and hope in the resurrection of the body.
By burying the bodies of the faithful, the Church confirms her faith in the resurrection of the body, and intends to show the great dignity of the human body as an integral part of the human person whose body forms part of their identity."
Taken from the instructions Ad resurgendum cum Christo
The entire Ad resurgendum cum Christo document may be read from the official Vatican web site.