I lurked around various threads and speculation videos to see what are the next LLs. Especially the wood elf sides. I am not interested very much on the other side as it is probably clan moulder( another variant of hell pit would be amazing doe). I know the free WE LL is drycha. It was hinted by being singular and female and then the trimmings kinda gave it away.
However the WE LL for the paid content I am still speculating. I think sisters of twilight wont be the next LL since they wrote "you can play in vortex with this lord (again singular)". So the choices remain araloth and ariel. I think araloth will be very cool however, I have to see ariel in this dlc, there is just no way. I think in their tree artwork they hinted araloth as the next LL with clouds on the upper left corner looking like a hawk more than a butterfly. I dont think that cloud its coincidence and usually CA is very subtle with its hints especially since this one took them one month to write according to graceCA.