Badass News found the logline at It's on the Grid:
"Aliens who were put on Earth as sleeper cell aliens to eventually call back their race to take over the planet. Ultimately, the group of aliens fully assimilates and don't want to cause war."
The Inhumans were created by alien experiments on primitive homo-sapiens. The alien race behind the experiments, the Kree, abandoned their work and the Inhuman went on to form a society of their own, which is led by the king Black Bolt and his family Medusa, Karnak, Gorgon, Triton, Crystal, Maximus the Mad, and the canine Lockjaw.
The project is out to writers, and no release date has been set.