I am also looking for the same thing, so far I came across Blade Runner: An Art Installation, Toxian City Dark Urban,
Miridian City? (I think you can get a observator tag and go and see what is happening before having to commit)
This is really all the evidence I've got, not sure if it is because no one reads the roleplay forum, or if role-play communities don't exist or exist on their own or something. Anyhow, I am continuing to explore more rp sims and shall let you know if I find anything worthy