Copy, with addition, of my post on IIP forum.
The CSC has considerable authority to render verdicts simultaneously with annulments. The final CSC verdict may be opposite to the verdict from the lower court that is being annulled.
The Italian legal basis for this is codified in CPP Articles 620 Annulment without referal and 621 Effects of the annulment without referral. CPP Art. 620 consists of one paragraph with 10 separate clauses, each providing for a different situation. Art. 621 gives the procedure to be followed generally after each one of these possible situations, but leaving considerable flexibility to the CSC.
Here are excerpts from CPP Art. 620 and 621 that appear to be potentially relevant to this case:
CPP Article 620
1. In addition to the cases specifically provided for by the law, the CSC shall deliver a judgment of annulment without referral:
a) ....if the prosecution should not have been started or continued;
d) if the appealed decision is not allowed by law;
h) if there is a contradiction between the appealed judgment or order and a previous judgment or order concerning the same person and the same subject, delivered by the same or another criminal judge;
l) in any other case in which the CSC believes the referral is superfluous or may proceed to the determination of the sentence or take the necessary decisions.
CPP Article 621
1. In the case provided for in Article 620, paragraph 1....in letter l), the CSC shall proceed to the determination of the sentence or give the necessary instructions.
In summary, Italian procedural criminal law gives the CSC the authority to do almost anything, including annul a judgment under appeal and pronounce a different sentence. Annulment without referral in Italy is not necessarily the same as a mistrial in the US.
Of course, there is no way to reasonably predict the judgment that the CSC will give in this case after the hearing on March 25. There may be four choices: CSC could 1) finalize the Nencini court verdict of guilty, 2) annul that verdict without referral and install a different verdict, 3) transfer the case to a United Sections panel for a more comprehensive review, or 4) annul all or some of the verdict with referral to a new 2nd level court trial. The CSC may or may not treat Amanda and Raffaele differently in its judgment. The CSC may or may not be arbitrary in its judgment, although arbitrary judgments are a violation of Convention Article 6, the right to a fair trial.
I should add the Nencini judgment is arbitrary, and if the CSC upholds it, they will be introducing a grounds for application to ECHR on arbitrariness of judgment (such as "manifestly unreasoned"). There are other ECHR issues with the case as well, as is well known (to those that objectively follow the case, not necessarily to any journalists).