Via Businessinsider.com:

During the annual “Star Wars Celebration” event from April 16-19, actor Mark Hamill told a great story of how he first heard about the new “Star Wars” trilogy.
Hamill said he, his wife, and Carrie Fisher were invited to a lunch by George Lucas’ people while at a “Star Wars” event.

It struck Hamill as a bit odd. The actor figured it meant something big was going on; however, he never imagined it was another trilogy.

“George had told me specifically, he wasn’t doing anything after the prequels,” Hamill told the audience. “He said, ‘I don’t want to be doing these things in my 70s.'”

Hamill’s best guess was that they were re-releasing the films in 3D, and Lucas was asking for the original cast to do press. That, or the films were getting another video release.

He figured that even if they were to do another trilogy someday that it would be about another generation. The films wouldn’t need him back as Luke Skywalker.
“I had a beginning, a middle, [and] an end. My story was finished,” he said.

So you could imagine Hamill’s surprise when that was exactly the news Lucas told him.

Here’s how Hamill said Lucas broke the news, while doing his best impression of the “Star Wars” director:

“Basically, um … I’m moving on. I’m going to be leaving Lucasfilm and Kathy Kennedy’s going to be taking over. And, uh, we’re thinking we’re gonna do another trilogy.”

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