That is actually a conjecture going around. It is not accepted as fact at this time. The current Ebola strain may actually have lower mortality than the well-researched Zaire strain, etc., but it is not known for sure.
That was the figure I have been reading. I admit that I am simply reading many of the same main stream articles that everyone else is getting.
The only mortality rate I am concerned with is 100%. 100% survival rate of my family and me.