User blog comment:Kogath/Monster Hunter: World Discussion/@comment-25083735-20190730190724/@comment-25083735-20190730191749

For variants, theres potentially 5: Ruiner Nergigante, Shreiking Legiana, Rusted Kushala, Raging Brachydios, and Savage Deviljho. Assuming they continue the pattern, I wouldnt be suprised to see bazelgeuse get a variant, and maybe even teostra and lunastra to keep up with the pattern of nergigante and kushala.

To my knowledge, most, if not all of the new monsters in world will be getting either a subspecies or variant. There are a few that i doubt will get one or need one, but for the most part majority of the monsters should have one.