Well, this development, if it is true - may be stunning.
First of all, though, I don't trust the Daily Mail in terms of their reliability for presenting factual news. Even when they don't simply invent news, they (and other media, sometimes even responsible media) get things wrong. Also, the DM strives to put a sensational slant on what it prints.
It's possible that Amanda Knox and her lawyers have requested interim measures from ECHR. Those are orders to a State to not do something, and they have immediate effect. But they are generally (always, I thought) reserved for what ECHR considers life-and-death emergencies, such as extradition from a Council of Europe country, where supposedly one will not be tortured and/or killed, to another country where there is a real risk of such treatment. Here is an excerpt from the ECHR fact-sheet on interim measures:
So I tend to think that interim measures are not involved. Also, I would think that interim measures are announced by the ECHR, and not publicly stated as requested by one's lawyer, but that is my guess on the protocol and procedure. I have been wrong before.
My thought is that in her recent (rumored) appeal supplement, Amanda and her lawyers pointed out that she had lodged a complaint with the ECHR about the violation of her human rights by Italy with regards to the simple calunnia conviction. Since ECHR case-law is overwhelmingly in favor of Italy being found in violation (IMO, and I've a read a fair amount of ECHR case-law), Amanda and her lawyers may have suggested that the CSC delay any final decision until the ECHR acts. This act might be the communication of the case to Italy or it might be the judgment by ECHR. Such a suspension, especially until a judgment by ECHR, would lessen harm to the defendants, and certainly to Raffaele, who would probably be imprisoned if the conviction were finalized, and also to the reputation of Italy when it otherwise would be found to be in violation of multiple human rights protections of the Convention. But again, this is guessing on my part.
If the suggestion on suspension of the case to await ECHR action was in the appeal supplement, I assume that the civil lawyers and the prosecutor learned of it when they received their copies of the appeal supplement document.
If someone else has ideas or knowledge they are free to contribute, I would welcome learning more about this development.