As players enter and qualify through open tournaments starting at the national level, the goal of the StarCraft II World Championship Series is to identify a true global champion. At each National Championship, the top finishers will earn spots at their continental Finals events. This allows local heroes to rise to the top and be recognized in their country. The National Championships are designed to aim at that kind of reasons. The events will be an all-out brawl between neighboring countries. This is to determine who will represent their continent at the Battle.net World Championship.
On the other hand, leagues are "locked,” at the end of each ladder season. Season 6 is now locked. It will not promote or demote out of current league or division to players. What’s more, bonus pools will stop growing. But, players will still be able to play out their remaining bonus pool and compete for standing within their divisions until the season ends one week later. Thus, there is no reason to stop playing even after leagues are locked.
Games played during the lock still count toward Season 7 league placement as the matchmaking skill ratings which determine league promotion and demotion will also continue to update. Season 6 will soon come to an end since the lock is in effect. It is said that during the week of April 9, Season 7 will be turned over. Following the season roll the Grandmaster League will start one week. Season milestone rewards will be awarded. With the beginning of the new season, bonus pools will reset. In a previous season, players who have completed placement matches will only need to play one new placement match after Season 7 starts as hidden skill ratings used for matchmaking and league placement will carry over from the previous season.