I mean yeah, he was still surprised about the fact that Lucasfilm was sold to Disney, but the existance of Episode VII didn’t come as a shocker to him. He had already talked to George Lucas about it over a year before hand. During an interview with EW, they wrangled the story out of him, in which Hamill revealed that he, Fisher, and Lucas shared a lunch one year before hand…a lunch in which Lucas dropped the bombshell that Lucasfilm would be making another trilogy.
“Yeah, last August, he asked Carrie and I to have lunch with him and we did. I thought he was going to talk about either his retirement or the Star Wars TV series that I’ve heard about — which I don’t think we were going to be involved in anyway, because that takes place between the prequels and the ones we were in and, if Luke were in them, he’d be anywhere from a toddler to a teenager so they’d get an age-appropriate actor — or the 3-D releases. So when he said, “We decided we’re going to do Episodes VII, VIII, and IX,” I was just gobsmacked. “What? Are you nuts?!” [Laughs] I can see both sides of it. Because in a way, there was a beginning, a middle, and an end and we all lived happily ever after and that’s the way it should be — and it’s great that people have fond memories, if they do have fond memories. But on the other hand, there’s this ravenous desire on the part of the true believers to have more and more and more material. It’s one of those things: people either just don’t care for it or are passionate about it. I guess that defines what cult movies are all about. We’ll see.”
So when fanboys first heard this, they probably assumed that Lucas informed Fisher and Hamill SPECIFICALLY because they would be involved in the trilogy. In which case, calm down fanboys; Lucas was probably just having a lunch with friends and the subject came up. Well I’m not saying the original casts return isn’t out of the realm of possiblity, just don’t take this event to mean anymore than it actually means.
Still…it would be pretty cool if the original cast came back, no?