As noted earlier, Vin Diesel recently revealed at CinemaCon that Fast and Furious 7 will be released next summer on July 11th, 2014. According to Diesel, the whole cast - including The Rock - would return for the sequel.
Deadline.com reports that shooting for the flick would start in August, which would present a problem for The Rock, who will be filming Hercules this summer. Rock told Collider.com that it would be impossible to shoot for the film that soon. He said:
"It's not possible for me because I'm shooting Hercules this summer starting in 6 weeks in Budapest, so, possible for them I'm not too sure. I haven't heard anything about that and I'm pretty sure I would have gotten a phone call pretty early in the morning if that was the real plan. Not quite too sure though."