Best answer: The Caves & Cliffs Update, one of the largest updates for Minecraft ever, has been split into two parts and partially delayed. Instead of the initial "Summer 2021" release window, Mojang Studios is releasing the Caves & Cliffs Update in two separate parts. Part I of the Caves & Cliffs Update officially releases on June 8, 2021, and mostly contains new mobs and blocks. The larger second half does not have a confirmed release date yet, but is expected to arrive in Winter 2021.