According to a post made on Vin Diesel's Facebook page Saturday, actor of "Fast and the Furious" and "Guardians of the Galaxy's" Groot character seems to have made some kind of tease in the posting in regards to being "Inhuman." Since the word is spelled with the first letter being capitalized, it appears Diesel is making the hint rather obvious as a proper noun.
Rumors have been going around about Diesel portraying the Inhuman Black Bolt character and in the past, Diesel had been talking about merging brands. There's a nice photo of himself as Groot on his Facebook page, but considering that he's also a comic book fan, it stands to reason that he'd be excited about posting a hint online.
Diesel has voiced the character of Rocket's muscle, voiced by Bradley Cooper, and expressed he had even expressed during takes of him voicing "I am Groot" on numerous occasions that would exceed 20 times saying the famous line. He's even said it in different languages.
He felt that though he doesn't physically play a role in the film, that he would put in the extra effort and time to focus on the voicing of the character. Diesel even mentioned that next to each "I am Groot" line in the script, there was a side-by-side lengthy English version of what Groot would be saying and inflecting so the "Fast and the Furious" actor could get an idea of what Groot is feeling at the time of the vocal delivery.
Basically taking what Groot was saying and then distilling it to a point to bring life into the character. Apparently, it wasn't necessarily difficult, but tricky. Diesel also expressed how the director felt about the character and how much this meant to the film.