The cause of death for both Neve and Clarke remains unknown. Police say the accused was known to the couple, but are yet to add anything further.
Detectives have made several calls to the public for information about the fire, and were particularly interested in sightings of people, vehicles and motorbikes, near the Wesley St scene in the early hours of January 22.
They last week promised ''identity protection'' for anyone who came forward with information, in a bid to boost their collection of evidence.
The accused was remanded in custody and will reappear in the High Court on March 13.