One of the nicest things about the 77W ... engine choice isn't a worry! (Has to be GE90).
It will be interesting to see what this order means for the A350-1000; TC indicated annoyance at Airbus's plans to shift to a different engine, but he didn't seem too upset about the change from RR to GE on the 777s.
Still, great news for the 777; it will be interesting to see if those options, or indeed part of this order, is converted to the 777NG, once it's launched.
http://jetphotos.net/viewphoto.php?id=7149076&nseq=0