Technically, right now, there is no plan. For the first year it would probably be:
24/36/48 teams randomly placed between the 2/3/4 divisions
Top 6/4/3 move to the premier league for 2018; Middle 6/4/3 move to the 2nd Tier; Next 4/3 to the 3rd Tier; Bottom 3 to the 4th tier (48 teams)
Advancement in subsequent years would like be:
Alternatively we could have ways for the lowest tier winner to move to the premier league, etc. Once we have an accurate head count I'll work out the mechanics and tweak the generic rules template accordingly.