What I think it is....
In regards to a potential 757/767 replacement, I guess what Boeing may be working it is something like this:
1. It will use the current 767 fuselage cross-section.
2. It will sport a new nose and new tail design.
3. It wil have a new, lower-drag wing with raked wingtips.
4. It will be powered with the latest variants of the PW4000, CF6-80 or Trent 600 engines.
5. The long-range variants will have at least 6,500 nautical mile range and cruising speed about the same as the 777-200ER.
In short, the only thing in common with the 767 is the main fuselage section--everything else will be brand new.