Vin Diesel is a man who can see in the dark... well, he's got a movie out in theaters now. You should probably go and see that. But maybe you don't care about the films, preferring the games that sit alongside the series that have been the subject of critical praise. According to Diesel, another one is coming and it's going to be an MMO.
Exactly what Diesel means by that is up for interpretation; what he cites is simply a top-level concept, which could mean anything from an online component to a fully featured shared space. He describes it as focusing on the mercenary trade in the fictional universe and allowing players a chance to interact with a larger scope of the game world. Apparently he's been talking up this aspect of the game since July, but somehow the rest of us were still in the dark.