On 17 November 2013, at the Dubai Airshow, Boeing officially launched the 777X, gaining many orders from the 3 major Middle-Eastern airlines. Qatar ordered 50 777Xs, Etihad ordered 25, and Emirates ordered a colossal 150 Boeing 777X aircraft for their ever expanding fleet.
Taken from the Wikipedia page about Boeing 777.
So with this amazing aircraft officially launched,I would like to suggest to FG developers,to start working on this aircraft for the FlightGear.
Here are the first images of the 777-X.
https://www.facebook.com/photo.php?fbid=556974884378616&set=a.556974734378631.1073741891.104563622953080&type=1&theater