Blizzard has updated one of their internal servers with the first 11.1.5 build, build 58955. Note that this build is encrypted and we don’t have access to it, so we can’t datamine its contents.
Based on the WoW 2024 Roadmap, we should expect 11.1.5 to drop around early to mid of Spring, so likely late March or April. This patch will bring new content known as Nightfall as well as a return of Horrific Visions originally from Battle for Azeroth.
