Plans are constantly changing at Emirates. That is the only thing you can be sure of. B777 classes will be ongoing through the year, whether or not they are full until June I don't know. But that doesn't mean they won't add more classes for something like a newly announced ULR route ( Washington D.C. for example ). Also doesn't mean they will not revise the whole A330/340 retirement plan. A number of A380s are sitting on the ground awaiting repair work, thus needing more A330/340 pilots then originally planned.
TP