British Airways has confirmed that Johannesburg will join Hong Kong and Los Angeles in its network of destinations served by the Airbus A380.
BA will operate an A380 service on three weekly return flights from London to Johannesburg from 12 February 2014 and six weekly return flights from 10 March 2014.
Full details of the exact flights are on the BA website.
What all these destinations have in common is that no other airline operates a direct service from London using an Airbus A380 which provides some pointers as to what additional destinations may be served by the A380.
Update January 2018:
BA operates the Airbus A380 on both of its twice daily services from London Heathrow to Johannesburg until Saturday 24 March 2018. From Sunday 25 March 2018, flights BA55 and BA56 continue to be operated with the Airbus A380. Flights BA57 and BA54 are operated with a Boeing 747.