Police charged Lars Faleata, 26, from Zillmere, in northern Brisbane, over the deaths of Joe and Christine Stephan, aged 73 and 68, at their Collingwood Park home on January 23.
Detectives said earlier the couple had been killed in an "act of violence" rather than the fire.
Faleata's case was mentioned in Brisbane Magistrates Court for the first time on Monday after his arrest overnight.
He has been charged with two counts of murder and the dangerous operation of a motor vehicle.
Faleata has been remanded in custody to have his case mentioned in the same court on March 14.
Detective Acting Superintendent Stephen Blanchfield thanked the public for their help with the investigation, but indicated it was still an open case.
Officers are trying to trace the movements of a black Mercedes, which was stolen from the couple's home on the night of the fire.
Det Supt Blanchfield has asked for anyone with dashcam footage of Zillmere Rd, Aspley and Robinson Rd West, Geebung, between 10am and 1pm on January 22 to contact police.
"While the vehicle has been located, any information regarding its movements is of great importance to us while investigations are ongoing," he said in a statement on Monday.
Joe and Christine Stephan, who had two adult children, were found in the lower level of the home that caught alight in the early hours of January 23.
Detective Inspector Heath McQueen said at the time they had died from significant injuries caused during an act of violence, and not as a result of the fire.
Charges against a 28-year-old Ipswich man over the deaths have been dropped.
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