Very unlikely you will be upgraded on us. Even our yearly FOC is in coach, and only very very rarely upgradable. Staff in the US tend to be more liberal and might let you into a lounge or something, but i wouldn't bet money on an upgrade sorry.

747 economy/coach class seats aren't that great, unless the aircraft has been fitted with the new product which is very nice. Better seat pitch and the chair reclines down in a shell, so no one reclines on top of you!