Confirmed
Top 3 American teams from league qualify
Top 3 Pacific teams from league qualify
Top 3 EMEA teams from league qualify
Speculation
The 2 Chinese teams from Tokyo qualify for Champions too
The winner of Tokyo grants their region's LCQ an extra slot, so each LCQ has 1 slot except for the region that wins Masters, who will have 2
The rumored Summer league in China (separate from the FGC tournaments) acts as an LCQ tournament, granting 1 slot
Final slot allocation:
4 Americas
4 Pacific
4 EMEA
3 CN
+1 to the region that wins Tokyo
come back to this when I'm right