The League has underwent a big change to it's format. To read the full description head here: https://www.joindota.com/en/statics/league_format
Setting apart Season 15
In a break from tradition, Season 15 features smaller groups and no playoffs for the Amateur Divisions, resulting in a more fluid tournament process. This way, players now get to schedule their play days as they see fit, face off opponents at their skill levels much sooner and eventually climb the ladder to the top of the pile. Each Premier Division match will be streamed live via joinDOTA's official Twitch channels with commentary by Gareth Bateson and other Dota 2 experts from joinDOTA’s Berlin-based studios.