Do we know anything about it? My best guess would be: 2 groups of five round-robin, eliminate the bottom team, then double elim bracket with the remaining 8 teams, seeded based on performance in the group stage.
Bottom 3 get eliminated then the top 2 from each group play in a 4 team bracket. That's how Riot does it in league, but there is a play in tournament. But since there's only 10 teams they will prob do 2 groups of 5 with the top 2 from each group advancing