When does Spartacus: House of Ashur return?

Spartacus is an American historical drama television series created by Steven S. DeKnight. The series was inspired by historical figure Spartacus, a Thracian gladiator who from 73 to 71 BC led a major slave uprising against the Roman Republic. A sequel series called Spartacus: House of Ashur is in development at Starz, with DeKnight returning to write for the show.