Emile is either black or Russian. That's what the vocal analysis tells me.
As for this trailer, looks like we know what Charlie Hotel looks like, for sure this time. And it makes sense that she sounds like an older Cortana; the AI was made from Catherine's flashcloned brain.
As far as knowing about the SIII project, it's possible she doesn't, quite yet; she may be under the premise that they're a small SII class, or maybe in the novels, she has suspicions that she hasn't confirmed until Ghosts of Onyx. It could be she found out because of her close involvement in Project MJOLNIR.
In any case, I'm lovin' it.