Be patient my son, all will be revealed.   

What Ant said, but I think he means 5 out of 7 playoff winners will be promoted.  See this from the Kent Non League Website:  (Particularly the last line!)"The Clubs in the bottom three places in each of the four divisions at Step 3 at the end of the Regular Season will be relegated to a feeder pool and placed in the most geographically appropriate division at Step 4 for the following Playing Season.They will be replaced by the Club finishing in 1st position in each of the seven divisions at Step 4 together with a further five Clubs to be determined by a series of Play Off Matches.In each division at Step 4, The Play Off Matches shall be played so that the highest placed of the eligible Clubs plays against the lowest placed and the other two Clubs play each other (the “Step 4 Initial Play Off Matches”).The winners of each of the Step 4 Initial Play Off Matches will play each other and the winner of those matches shall result in seven teams eligible for promotion.The five Clubs to be promoted shall be the five Clubs out of the seven divisional Play Off winners with the best points per match ratio in the Regular Season.If there are only three eligible Clubs then the highest placed shall receive a bye to a second match where it will play the winner of the other Play Off Match and the winner of that match will be promoted. Clubs finishing below position 7 will not be considered for Play Off Matches.The promoted Clubs will be placed in a feeder pool and placed in the most geographically appropriate division at Step 3."In short, 2 Play-Off winners will not go up from step 4!

Ant is correct. The leagues at Step 4 will produce 7 league champions - all 7 will automatically be promoted. The Step 4 leagues will also produce 7 playoff winners and the 5 play off winners who had the highest points per game average during the regular season will also be promoted meaning that the 2 play off winners with the lowest points per game averages will miss out

I wish that I hadn't asked 🙇

Is there also a chance the leagues might restructure again this year?

What was wrong with the old two up two down system. At least everyone knew what was required, either to avoid relegation or promotion.
Theire is an old adage "if it aint broke don`t fix it" but some people like to meddle!

As I have previously said on different footballing subjects that there are too many old men at the FA who are rich people & dont really know too much about the beautiful game. I dont know how many of them came to the decision on the play offs, but i am willing to bet that if you where to ask one of them to explain it, that the individual wont be able to tell you without asking the others. I dont know how long it took them to restruct the divisions, it took me 20 minutes to deal with the Premier division & its not like theirs.(Well the majority is)

The upshot seems to be that, even if we were to progress through the play-offs, we wouldn't necessarily be going up to the Bostik Premier, but could be placed in a more 'geographically appropriate' division. Not sure who works that out, but Met. police for example, got moved from the Bostik premier into the Southern Premier and now have very few fixtures within the confines of the M25, facing costly trips to the West Country & even Wales. At least in the Bostik Premier the majority of teams are still in and around London & the home counties making almost all of the trips manageable.