See Botswana Marburg article and analysis above. The concern we have is not with an outbreak in Luanda but an ongoing outbreak in Cabinda City/Povo Grande--which is significantly closer to the DRC than Luanda.
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It hasn't happened, and there would be no way to cover up an outbreak there.
So, the virus is still in a very select area within Angola, almost exclusively within Uige, and now possibly in Cabinda City. But Cabinda City is where the virus was first identified, so it may not represent much of a spread, especially since it's very close to Uige, anyway.
Hopefully, the suspicious cases in the Congo turn out to be something else other than Marburg, but even if they are, this virus while extremely deadly, isn't appearing to be transmitted as easily as the flu.