So what I could determine is that the Cartoon Network commissioned a series of animated shorts for its Saturday morning DC Nation block. One of them is titled Thunder and Lightning, which follows the exploits of the DC superhero Black Lightning (voiced by Blair Underwood) and his super-powered daughters Thunder (voiced by Cree Summer) and Lightning (voiced by Masasa Moyo). Thunder and Lightning receive their costumes from Peter Gambi (voiced by Jeff Bennett) in order to help their father fight crime.
Of course I mention this because Black Lightning and his 2 superhero daughters are black.
It appears the first short aired last month; I read several comments on various blogs from fans wishing that the Cartoon Network would make the superhero trio a regular series; so apparently, it's not an ongoing series. However, a second short was released earlier this month I believe. So it could be that the network wanted to test the waters with the shorts, and if audience reaction was strong, they'd consider turning the shorts into a regular series.
But maybe those of you who have been following this more closely can add to what I've said here...
I did find a 2 clipsfrom Thunger & Lightning, which are embedded below. But first, to set things up a bit and for some back-story, I found this interview with Lynell Forestall, the writer and director of the shorts, talking about how they came about - from what his initial pitch was, to how he ended up with what you see in the finished shorts: