As things stand today, it's actually the 207 that is planned to be operated by the A380 and the 209 will be operated by a 787-10. However, as others have pointed out, there's no way to know for sure this far out whether that plan will stick, or whether BA will adjust that plan nearer the time.



The best advice I can offer is to pick the flight with the best times/price to suit you, rather than hoping for a specific aircraft.

Edited to add: my 380th post on FlyerTalk is about the A380.