Some counties have already publicly expressed their preferred options.
Surrey and Somerset have supported an eight-team top flight and 10-team second tier, retaining 14 games per season.
Middlesex have backed the status quo: 10 teams in Division One, eight in Division Two and 14 games.
Durham and Lancashire have thrown their weight behind the 12-team top flight, while Worcestershire have supported both the conference and 10-team first division.