I imagine it would also depend on the size and depth of the bestiaries in the various supplements themselves. For example if the Mythic Iceland ( which I'm really rather looking forward to ) pulls out the stops and gives a huge bestiary from Icelandic/Nordic myth then there wouldn't be much call for further material in a monsters supplement, likewise the same might well apply to the Mythic Rome supplement, good bestiaries in real world settings might render the idea of a monster manual redundant.
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