According to Amadeus, that would be a 74E, e.g. a B747-400 Combi.
However, Amadeus still has the flight leaving from CPH (CA912 CPH-ARN-BJS) in its system, so I don't know if this information is reliable.
Maybe the information is very new, and the flight hasn't been withdrawn from the reservation systems. At this time, it is still open for booking ex CPH.