The only planes in the world that could make it from Hong Kong to Memphis, according to about 15 minutes of quick research, are the Airbus A380 (In fact it would be sputtering the last of it's fuel fumes as it landed) and i think that is totally unloaded weight, and no doubt some military planes could go that distance and further.
It's probably true (though unfortunate) that it goes to Alaska first, which sucks, because my ipad is heading straight to south carolina.. quite a distance away

Probably a wednesday, thursday or even friday delivery for me.
edit:
Just looked at boeing 777's, there are one or two special models which could indeed make the trip. I know FedEx has 777's but who knows if they have one of the few variants to make the 8000m trip. And even if they did, who knows if it's one that is picking up our iPads.