Yesterday’s appeal was an appeal of the original conviction. Both of Knox’s lawyers state the Supreme Court sent the case back to the appellate level. Knox herself admits this on her blog. The past acquittal happened at the appellate level.
The Supreme Court threw out the results of that appeal and sent the case back to the appellate level to re-hear the appeal of the original conviction. Yesterday, Knox lost her appeal, and her conviction was upheld.
Knox and Sollecito will now appeal to the Italian Supreme Court, which will need to affirm the ruling for the judgment to be considered “final”.