Blizzard is bringing back 6v6 matches in Overwatch 2, with testing set to begin in December's Season 14. This format change aims to make the core game stronger by introducing a balanced version of classic 6v6 mode, allowing multiple tank characters per team. Two test modes will be available, featuring different role restrictions and flexibility.

Source: https://www.theverge.com/2024/10/24/24278781/overwatch-2-season-14-6v6-test