Several new sporebat mounts have been added in the latest Dragonflight Patch 10.1 PTR build!
Api Biru Sporebat
Api Biru Sporebat is the only one with a source so far, obtained through trade with the Ornate Gold Exchange Niffen Sacratros for 500 Coveted Bauble, though we can presume that most of these mounts will come from activities within the Zaralek Cavern. Other datamined sporebat mounts include Fire, Stone, and Flaming variants available in several colors.