If I had to bet on the outcome I would (a) not be surprised that this was confirmed, and (b) expect that the "answer" explanation is to adjust the speed of light.
I would be quite surprised if this were the answer. The speed of light is known to an extremely high accuracy; the uncertainty is a few parts per billion. In fact, the meter is defined so that the speed of light is exactly 299,792,458 m/s.
Given the inherent difficulties in even detecting neutrinos, it seems very unlikely that we would be able to determine the speed of light in a vacuum more accurately by measuring the speed of neutrinos than by measuring the propagation speed of e-m waves which are extremely easy to detect.