Well when EK announced an upgrade on SEA from a 77L to a 77W. They announced ORD. ORD will get the 77L. I guess Emirartes like to start US routes with a 77L.
This is why I'm saying they can use the free 77L on MIA. Rumor has it saying (couple months ago) that Emirates will launch MIA in October. Right when DFW gets the A380.
It all makes sense.
MIA has to be the next US destination for Emirates. It makes sense. After all, Emirates mentioned MIA so many times. I guess we can expect something.