The ruling was originally due to take place on January 15th but has been moved due to a lawyers' strike earmarked for January 13th-15th.
The retrial of Knox, an American, and Sollecito began in late September after the pair's aquittal for the 2007 murder was overturned by the supreme court earlier this year.
Prosecutors have asked for a 30-year prison sentence for Knox and 26 years for her ex-boyfriend Sollecito, arguing her punishment should be harsher because she initially accused someone else of the crime.
Kercher, an exchange student from London, was found half-naked in a pool of blood with multiple stab wounds on November 2nd 2007 in the house she shared with Knox in the university town of Perugia in central Italy.
Knox and Sollecito, who have both protested their innocence, served four years in prison for the murder.
Rudy Guede, a local petty thief and drug dealer, has been convicted separately and is serving a 16-year sentence for the gruesome murder with no appeal.
Prosecutors say the DNA evidence, which is highly disputed in the case, showed that Sollecito and Knox had stabbed Kercher while Guede sexually assaulted her.
If they are convicted, Knox and Sollecito can still appeal to the supreme court and the chance of Knox being extradited from the United States is extremely remote.
Sollecito has attended two trial hearings but has been spending most of his time in the Dominican Republic.