During BlizzCon 2023, we were able to play the fifth chapter of the Patch 10.2 campaign, A Dream of Fields and Fire. Although we were not able to take pictures or recordings of the chapter, we were able to write down a summary of what goes down in the chapter!
At this point, Fyrakk and the Druids of the Flame are sieging the area near the Wellspring of Life, and we are tasked to complete a series of quests that involve defeating lieutenants from the Druids of the Flame and helping strengthen the defenses around the Wellspring by planting seeds that bring new units, or freeing Ancients of War from the clutches of the Djaradin.
At this point, Fyrakk is consistently blasting the area near the raid entrance with fire, and being killed by him in this manner does grant the achievement Still Standing in the Fire if you haven't earned it.
In one of the quests, you're requested to help Alexstrasza destroy flame wards around the Wellspring of Life. Once the last flame ward is destroyed, a new cutscene plays out.