Here is an NTSB update:
"The fault lies not with the taxiway per se, but rather with the taxiway lights. They found it convenient to change color from blue to white as the CI A340 approached. This must be the absolute gospel truth. This is the story that the pilots gave the investigation team. If the plane had crashed and the pilots died, then it would have been much easier and more convenient to blame pilot error (we would have done this), but since the pilots gave the one and only side to the story (The taxiway lights took the fifth amendment and refused to testify, fearing criminal action), then we must go on their story. Furthermore, the A340, with a reputation of having poor takeoff performance, was saved from certain collision with the snow berm only when Superman can out of nowhere and lifted the plane above the berm. This must be the truth. It's what the pilots said, and we know they would never lie to us. So the pilots are not guilty of any wrongdoing, and will be restored to normal flight status without further delay"