imageFrom the Holy Shroud Official Site provided by the Diocese of Turin:

From december it is possibile to make an online reservation to attend the Shroud exhibition from 10 april to 23 may 2010.Reservations are required.

During the exhibition it will be possibile to enter the Cathedral without a reservation but then the Shroud will be only visible from a distance.

It will also be possibile to make a reservation directly in Torino at the "reservations area" you can find at the beginning of the exhibition route.