This new luxury tax became law back in December. There was a hastily and badly written addition to include all privately operated aircraft as opposed to just Italian registered aircraft for which it was originally intended. The law makers have until February 6th to advise how (and indeed if) this law is to be enforced, when and where the tax will be collected etc and finalise the legislation.
The Italians don't know how this is going to work and it's suspected that it will revert to apply to Italian registered aircraft as was originally drafted or worst case that non Italian aircraft will be charged on a pro rata basis. Either way, it's bad news for Italian GA.
Maybe we will hear something more definite during the week