That's what I read before too, but today I came accross different info here.
According to this, there will be three stages again. World Cup is essentially replaced by World Qualifying Tournament, with pretty much the same formula: 12 teams (host, world champion, 2 best ranked teams per continent), top 3 qualify for the Olympics.
After that, there will be continental qualifiers, with one qualifying quota per continent, like before.
And finally, the best 12 ranked teams not already qualified will be divided into three groups of four teams, and the winners go to Tokyo.
If this is true, the qualifying system remains basically the same.
As per latest news :
1 ticket host Japan
3 tickets WQT (12 teams = host , WCh, 2 best teams from continents)
3 tickets 3 tournaments = 12 best (not qualified) teams as per FIVB ranking based on 1st January 2019
5 tickets Continental tournaments (terms/rules - unknown)
Such combination with last step Continental qualification looks ok as stronger qualified teams will not participate.
FIVB and IOC have to announce final decision with all dates latest in Feb. 2019.
I still cannot believe why FIVB use such unclear systems modified for each OG qualification ?