Boeing is into studying a further stretch of the 777-300X by 8 meters to seat around 60-80 more passengers!!! The aircraft will be a potential 747-400 replacement targeting many Asain airlines such as Korean Air and CX. I think its great !
Now that the 777-300X will be over 80meters long, I am quite curious to see what it will look like? A london tube? Ha! By the way, Boeing said the range will be around 13,500km. I don't believe this beacuse the aircraft is being enlarged, and therefore becomes heavy and requires more power and fuel. One suggestion-why not enlarge the wing to hold more fuel!
There are now a few airlines studying at the design and the -300X seems quite attrative too!