Aspen
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Actually my rational is that lengthening has more to do with reducing trans/supersonic drag, improving area-ruling. FC-31 at it's current form is far from being able to super-cruise, therefore I think they'll do everything possible to achieve it, with new engine.
It's possible that they are lengthening it for supercruise ability, but I would have thought that the original design would have accounted for this. I think powerplant efficiency matters more for supercruise than supersonic drag but others would know better than me on that. I am leaning toward theory that lengthening is because of weapons bay constraints. Not being able to carry large enough missiles is really a huge problem that is non-negotiable in my opinion. If small weapons bay turns out to be a problem, evidence of new larger weapons bay would be pretty clear proof that this issue had at least a partial role in changing size of plane. But I think this actually introduces a new problem which is that with stealth planes, a concealed weapons bay means you will have size constraints on any missiles designed after the plane goes into service. So alternative solution to enlarging the plane is to make the missiles smaller as this technology will have to be developed at some point in the long term anyway.