There is still no official information regarding the name and the official schedule of the World League but I will post the schedule I came across today and will eventually fix whatever is wrong.
Weekend 1
Group 1: France (host), Australia, Iran, Japan
Group 2: China (host), USA, Argentina, Bulgaria
Group 3: Poland (host), Russia, Korea, Canada
Group 4: Serbia (host), Germany, Brazil, Italy
Weekend 2
Group 5: Bulgaria (host), Australia, Russia, Serbia
Group 6: Brazil (host), Japan, Korea, USA
Group 7: Argentina (host), Iran, Canada, Italy
Group 8: Poland (host), France, China, Germany
Weekend 3
Group 9: Canada (host), Australia, USA, Germany
Group 10: Japan (host), Italy, Bulgaria, Poland
Group 11: Russia (host), Iran, China, Brazil
Group 12: France (host), Serbia, Argentina, Korea
Weekend 4
Group 13: Korea (host), Italy, Australia, China
Group 14: Germany (host), Argentina, Japan, Russia
Group 15: USA (host), Serbia, Iran, Poland
Group 16: Bulgaria (host), France, Canada, Brazil
Weekend 5
Group 17: Australia (host), Argentina, Poland, Brazil
Group 18: China (host), Japan, Canada, Serbia
Group 19: Iran (host), Germany, Bulgaria, Korea
Group 20: Italy (host), USA, France, Russia
This is still not official but I got it from what I believe to be a reliable source. I apologize in advance if there are mistakes. I will fix the schedule and the pool composition once it becomes official or when some national federations publish it separately.