The answer is in a @flightglobal blog posted just last week here and in a patent filed by Boeing here.
Boeing is exploring variations of its classic 747 design that would incorporate larger engines or open rotor engines mounted on a wing that passes through the middle of the full length, double decker aircraft, as you can see in the sketches below.
Here is the overview.
Here you see how they intend to integrate the wing box into the middle of the fuselage.
Finally, a glimpse of the open rotor variant — the size of the rotor is the reason for mounting the wings mid-fuselage.
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