It was never quite confirmed whether his role was serious, but Vin Diesel finally revealed earlier this month that he’s planning on playing Groot in director James Gunn’s now-filming Guardians of the Galaxy, though the deal is not yet fully complete(whatever that is supposed to mean).
In a separate interview with The Hollywood Reporter, he explains that his upcoming slate is actually what brought the Groot role his way. “What we were intially talking about was a fresh IP,” says Diesel, “and that was the focus of our conversation. A fresh IP that would come out in 2016 or 2017 to potentially launch a third phase. When we went to Comic-Con, we realized that we wanted something more immediate.”
What this means is still unknown, as there are circulating rumors about many roles he could possibly play in the future as well as Groot. He could very well be hinting to a role in the two unnamed Marvel movies which have yet to be revealed. Stay tuned as this information is going to surface at some point.