Hey Mark,
I just noticed that ORD-DME is listed as a 777 in RES. Is this a definite change? Or are they trying to see if people are willing to purchase F/C? Also, any clue when the PEK route will be a final award?
It may be the result of a couple of problems with the 767 on that route. There is a problem with the accuracy of the autopilot in altitude hold. Russia uses meters instead of feet, the 767 has only a "100's" min knob function, I think the 777 can do "10's". The conversion to meters is the problem, not even.
The range/payload may be the other problem. You might be pulling people or cargo on the 767, although it used to fly CDG-LAX which is farther. I don't know the numbers on this one.