"That combination will make the Trent 7000 about 3,500 pounds heavier than the Trent 700. Even with that additional weight, and additional drag from the larger fan, the Trent 7000 delivers 11% better fuel burn on wing than the Trent 700."
Swh,
Would you like some humble pie? Or does this guy not know what he talking about either? So, it's looking like over 3 tonnes additional engine weight plus the 3 meter wing extensions plus wing strengthening weight. So, as I believe I stated earlier, weight neutral is BS. You're looking at about 5T extra OEW. It's just a fact. It'll still be a good airplane, but this can't bode well for short haul missions. If Airbus could have taken 5T out of the A330CEO, don't you think they would have done so already?
http://airinsight.com/2014/07/23/new.../#.U9AS2mS9Kc0