It has been suggested that you check as soon as possible even though the move has not been made yet.
All domestic and European flights excluding Barcelona, Madrid, Lisbon, Nice and Helsinki will move on March 27th.
The long-haul services to Johannesburg, San Francisco, Los Angeles, Vancouver, Tokyo, Hong Kong and Miami move on March 27th.
All remaining intercontinental flights move on April 30th excluding Singapore, Sydney and Bangkok.
It is important to check the Terminal you will be leaving from before travelling to avoid disruptons.