S3, Using the American system of law, the appeal or retrial should not have occurred. The evidences on the trial were already compromised. The interrogation were improperly conducted which put Know under duress to agree whatever the police accused her of. The knife in question was tainted and improperly handled by the police investigators. The blood samples were improperly handled by the investigators. The blood stained bra was also mishandled.
Thus, they cannot be used to prove the prosecutor's case. Essentially, the prosecutor has nothing to prove his case. As such, Knox has a very good cause for an appeal and reversal of the verdict. If this doesn't work, she can sue the Italian judges at the Hague (International Court) for human rights violation and apartheid. Regarding Sollecito, I believe he has a good cause for an appeal and reversal too. But it's not likely he's going to seek asylum in the US anytime soon. The latest news stated that the police confiscated his passport and IDs. So, he can't go anywhere outside of Italy. Moral of the story: don't get in trouble in Italy.