A different strain, by itself, is not very dramatic news.
Since there is no immunity to ebola, of any kind, it is unimportant as a factor. What matters:
A big drawback to ebola, as a disease, is that it is not infectious until symptoms are showing. It has an incubation period of between 2 and 21 days, and while that allows it to move around a lot, once symptoms show, the person will typically die within 10 days. And because they are incapacitated for half of that, this is what you see:
A person who looks like they have a bad case of the flu, staggering around and showing lots of symptoms. For just 5 days. So if you don’t want to get infected, stay away from people who are visibly sick.
That is not exactly true. British Doctor: 'Shocking' How Healthy African Ebola Patients Look Before Death
Seemingly "healthy people" can spread the disease.