Airlift - did Easyjet give a binding committment to flying on a definitive date ? Press reports indicate a committment to *considering* flying at Heathrow if R3 is built - which will not be ready for commercial use for at least 10 years. In any case, Easyjet was quite a different beast 10 years and its commercial focus will likely change further between now and 2024.
Every airline currently at Gatwick will consider moving operations to Heathrow while R3 is built - Easyjet aren't saying anything remotely surprising.