So theories?
13 or 14 people, in a simple game this would be 3 or 4 person mafia. Unknown Evil usually errs to the lower number because town at disadvantage.
If one bad team could be 3 with one recruit.
Alternatively, if multiple bad teams they could have 3 or members each (since bad teams would take out each other the ratio of town needs to be higher).
IBWT said this was a simple game so I don't think there will be many surprise new roles we're not familiar with.
I'm guessing either one mafia team with 3 bad guys (rising to 4 with recruitment maybe) or two mafia teams of 3 each.
To fit in a week there is probably a SK out there too to help bring numbers down.