For 64 teams, they would most likely give the bulk of the spots to Africa and Asia, especially in the hopes of China qualifying. Then likely a few more for the rest barring South America and Oceania who both would get one extra spot.
My thinking is something like this:
20 European teams
12 African teams
12 Asian teams
8 North American teams
8 South American teams
2 Oceanian teams
2 Intercontinental Playoff spots (between Africa, Asia, Oceania and North America)
I heard though that in preparation for the next World Cup there’s talk of all South American teams being in