Mordenkainen's Tome: what monsters are in it?

[Beechgnome]

I am kind of "meh" on the ushemoi. Humanoids whose bodies change to match their classes, becoming hulking warriors, four-armed rogues or portly mages. It may not be D&D's most comical concept, but still, I think it is a bit much.

But I am especially not fond of how 4e made them foulspawn, humanoids touched by the Far Realm. I feel they took a spot that would have been better occupied by the kaorti.

TBH, I'm not too familiar with either star Spawn or foul spawn. If you search you should be able to find the video they talk about both so not really sure which way the new monster will lean.