The current 24" iMac looks a bit underpowered and even the lower-end M1X would make the model a lot more attractive, especially for business users.
I'm still 99.9% sure the 2 fan version of the iMac were designed for a M1x/M1Pro (or whatever) which turned out not to be ready at that time.
So the question really is, will they add it now or with the spec-bump next year.