According to AusBT, the BNE flights are to NRT. I can only assume then that the HND service will go to SYD. See Qantas to start Brisbane-Tokyo flights - Australian Business Traveller
From The Australian
QANTAS will start flying from Brisbane to Tokyo’s Narita airport and will launch a new daily Sydney-Haneda Boeing 747 service as it expands its services to Japan next year by 4000 seats per week.
The daily service to Haneda, which is closer to Tokyo’s CBD, starts July 30 and is expected to be popular with business travellers. It comes after a previously announced breakthrough deal to get peak slots at the airport.
The airline will fly a four-times weekly Airbus A330 services from Brisbane to Narita from August 1 with three remaining weekly services to fly from an as yet unannounced second port, possibly Melbourne.
Fares for both services will be on sale progressively this week with launch fares for Brisbane-Narita starting at $899 return and available from December 12.