After several failed launches, Riot Games worked hard to get its League of Legends tournament mode back on track.
Clash will begin a new test on July 2 on the PBE. You can now register if you wish to participate in this test phase.
Changes are to be expected, including a new bracket system and an extended time before the game is locked. Many patches will also be available. The search time for a game should be around 5 minutes. Sadly, Teamfight Tactics will not be available on the PBE during the test.
However, be careful if you participate. The matchmaking is not balanced yet, which obviously will not be the case when the final version is released. So don't be surprised if you get atomized by a Diamond...