The following post by Diesel thanked fans for helping him come to an agreement with Marvel to do the voice of Groot. Diesel has long teased that he'd like to play another role in the MCU, but that given his schedule last year, all he was able to do was fit in a few days to voice Groot. While he's never directly stated what role or what film he has in mind, it's possible he might just have hinted at it today.
Was Diesel's capitalization of "Inhuman" an intentional tease hinting at a future role, possibly as Black Bolt, king of the Inhumans? There's no way to know, but it's certainly interesting given the actor's past use of social media to connect with fans and tease them about upcoming projects. We do know that Inhumans is one property that Marvel has been developing for sometime now and with several release dates open, perhaps Inhumans will fill a date (maybe 2017).
What do you all think? Was Diesel up to his old tricks? How would you feel if he were cast as the Midnight King? For those of you who aren't entirely familiar with Black Bolt, head here to read up in this Brain Splatter Meet and Greet.