Looking at the patterns printed on their heads and bodies, I think the creatures from Pharaoh's Quest are definitely intended to be colossal stone figures that have been magically brought to life, and have been sleeping patiently.
I think they have realized that the most successful formula for a new historical theme is to have it be "modern explorers versus gods/immortals/undead/mythological creatures". That way, you can include modern guns and vehicles, plus create some cool minifigs with funky new heads, plus an awesome posable monster made from all pre-existing parts, plus it keeps it all safely in the realm of "fantasy violence", rather than real historical human-versus-human warfare, and parents definitely prefer that. The same reason that The Clone Wars, etc. is usually humans-versus-robots or humans-versus-aliens.
I think that the Orient Expedition sets with the Yeti, Tiger, and Dragon-headed guardians first hinted at the trend, then the Vikings theme and the Lord-of-the-Rings-styled Castle sets developed it, and Atlantis and Pharaoh's Quest solidify it.
No?