The 422/3 to Perth will stop, which is a shame as it was the only Perth trip that arrived and departed there at a civilized hour of the day.
Correct, this frees up the 77L for the new EK227/8 to SEA.
EK422/1 is switching from 77W to A380 effective 01MAY15
EK 422 DXB PER 0255 1735
EK 421 PER DXB 2210 0525+1