As pointed out
earlier unitary patents will not cover Italy but Italy did sign the agreement on the UPC.
The UPC will be competent both for classical EP bundle patents and
for EP unitary patents. I think this means that any court of the UPC may hear,
say, an action for infringement in Italy (assuming the court is
competent) and that conversely, the Italian court may revoke your patent
for all states.
This could lead to a curious case.
Suppose I only have a unitary patent, and that an Italian company
infringes my unitary patent in Germany. As the patent owner, I then sue
with the Italian local division of the UPC. The Italian division could
then revoke the unitary patent for the whole of the EU, even though the
patent is not even valid in Italy.