I would love to know about the playable evils as well, or put more broadly: how much do you think will SBTT2 be the game That Which Sleeps promised? It doesn't look like we are getting the latter any time soon, sadly.
Sadly it does seem that That Which Sleeps isn't arriving.
The game should share a range of properties with it, but also differ in a number of ways. I tried to introduce agents in a previous version, but they didn't work with existing mechanics. I think the voting system is too interesting (in my opinion) to give up, as it allows the player to directly interact with the major mechanics of the game. As such, agents are somewhat abstracted away as just "actions" you can take.
Ideally we'll salvage what seems like a good idea, try stuff out, and produce the best game we can.
Remember there's no actual guarantee that the mechanics of That Which Sleeps would produce an interesting or balanced game, as we never got to play it, so we don't know if it worked together.