A couple of weeks ago saw Vin Diesel post an image of himself (above) on Facbook that read "Are you Inhuman?"
Vin Diesel also previously stated he was in talks for a new Marvel franchise that would merge the Marvel brands, which may mean the Avengers and Marvel Cosmic (i.e. Guardians of the Galaxy).
Vin Diesel voiced Groot for Marvel in Guardians of the Galaxy as well.
Inhumans has a November 2, 2018 release.