That certainly is what this patent application filed by EADS , which shows a modified wing-fuselage fairing that is supposed to reduce drag from the installation of a larger engine, seems to indicate.The problem would seem to be directly associated with the installation of the Pratt & Whitney Geared Turbofan (GTF) which has a significantly higher bypass ratio, and fan size, as compared to the engine currently used on the A-320 series.
The new fairing is the bottom of both pics.
Basically, it appears to be a sort of area ruling which accommodates the changes in air flow from a larger nacelle.
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