So based on the information we have this seems to be the most likely format:
Playoffs: 8-team double elim
The Guard, G2, LOUD and Paper Rex get seeded into playoffs, so they are guaranteed to make top 8
"Play ins": 8 team round robin (most likely imo)
(would take 9 days if 3 games are played a day)
Or
2×4 teams group stage, top 2 advance
Or
2×4 teams, top 1 goes to playoffs, top 2 and 3 go to another group of 4 where top 2 advances
Or
8 team quadra-elim bracket