Should be they're scaled for 28mm - with some variance from 28-32mm - eg tall professor, shorter girl, large Deep One creature.
Here's a pic to give you an idea:
From far left to right Warlord/Bolt Action, Artizan and West Wind followed by our Professor Deadman, Sgt. Carter and the Mi-Go. Increasingly large creatures will be coming out next - a Deep One Reef Breaker, larger Chthonians in resin, etc.