Today’s PTR update includes the Glory of the Aberrus Raider mount! The Scoria-Clad Sporebat will be awarded to players who complete all of the Glory of the Aberrus Raider achievements in Dragonflight Patch 10.1: Embers of Neltharion.
Interestingly, the mount doesn’t entirely match its description – although certainly molten, it doesn’t really look imbued by shadowflame at all. This could be indicative of a placeholder graphic, or simply creative license.