In an interview with Entertainment Weekly, Greg Grunberg talks about how J.J. Abrams is doing (“…All I can do is ask him, ‘How’s it going?’ and he’s like, ‘Oh, I’m really happy.’ So I know if he’s happy it’s just gonna be incredible,”) the trailer and shooting the movie in secrecy:
What I’m gathering from all of the pieces I’ve seen is it’s everything that a Star Wars junkie like me wants out of the movie. We got our script pages, only the scenes that we were in. Not even what was being shot that day! It was all on red paper so we couldn’t copy it or take a picture of it. And then we had to give the script pages back at the end of the day. And we didn’t get them the day before to take them home and learn them—Carrie Fisher and I were talking about it several times, like, “This is crazy! An actor does not get to prepare on this movie.”
He also said his role is “sprinkled throughout the whole movie, in a very small way.”
We don’t have any official word on Grunberg’s role, but it’s fairly obvious if you take one of Friday’s leaked images to heart. Note to spoilerphobes: The EW interview does contain a reference to said rumor.