There were few details on the actual product line beyond its name and logo, but it will be based on a Warhammer setting that occurs prior to Age of Sigmar. According to the lore, Archaon destroyed the world, and anything known about the Old World disappeared into the void. Afterward, the Mortal Realms emerged as well as the never-ending war in the Age of Sigmar. The new line's setting happens some time before the destruction of the Old World in an age of legends and mythic heroes. The Old World product line was described on Warhammer Community as follows: "The Old World is to Warhammer Age of Sigmar, as the Horus Heresy is to Warhammer 40,000."

Games Workshop is also announced that they are releasing new model kits for the Ossiarch Bonereapers faction (see "The Undead March Onward in 'Warhammer: Age of Sigmar'").