I think there are rumors that Dyana will replace Essie. The brothel madame is called Sylvie, so chances are she's meant to be Sylvenna Sand.
Still haven't watched the episode, and I don't intend to. I have all I need form all the talk on twitter and the images/vids, plus the knowledge that this Rhaenyra decides to endanger herself to talk to a woman she should have known has no real power anyway, and who has abused her for years before.
But if Dyana becomes Essie, that would mean that she likely is pregnant still w/Aegon's child, or they'll make it that way. Of course they could always have her get pregnant with Gaemon Palehair by some other man, but with her having been raped before and them not showing her try to use sex to reclaim her body OR become a prostitute to make ends meet, I don't see how they will make it plausible. And if they go either of what I think, that'll mean that this rape victim is likely going to die a heinous death by the same man who raped her (canonically, Essie and Sylvenna were hanged with a lot of people when Aegon comes back to KL). Sure, HotD could always change this as they have for many things that DEFINITELY happened, but the prospect they may not is troubling.