Mark your calendars! The first weeklong beta event for the WvW World Restructuring feature takes place from September 24 to October 1. On September 21, a new tab for the World Restructuring feature will become available in the in-game World vs World menu. On this tab, you’ll be able to choose which of your guilds you’ll want to play with during the World Restructuring beta event. Please choose your WvW guild before 11:59 p.m. Pacific Time (UTC-7) on September 23 or you may be matchmade onto a team as an individual player.
Read More:
https://www.guildwars2.com/en/news/studio-update-world-restructuring-and-the-future-of-world-vs-world/