I'll be (pleasantly) surprised if we see saurials covered in any detail in any 5e product, given how rare they are according to Tomb of Annihilation.I hope the Forgotten Realms books bring back classic critters from that setting, like the saurials and the sharn! (I really like the saurials in particular, so fingers crossed!)
Tomb of Annihilation said:Dragonbait is a champion of good and a saurial — a race that originated on a distant world and whose members have long lives. Very few saurials dwell in the Forgotten Realms, and no saurial communities are believed to exist anywhere in the world.