I may know both of these characters
the first black-winged flaming fist can be Marcus. a true soul who pretend to be a flaming fist and try to infiltrate Jaheira's harper
the second one is very likely to be the Nightsong. multiple voice lines suggest she's an aasimar paladin and as "selune's daughter". she's one of the significant characters of the whole dark justiciar thing. what you see is her finally freed moment.
however, does that indicate we will see playable aasimar? I don't think so. at least not in EA and even patch 9.
