In a 1983 video, Mark Hamill talks about a new Star Wars trilogy. In it he says that it would be shot in approximately 2011 and have Luke Skywalker handing the torch to the next generation in the same way Obi-Wan Kenobi did in A New Hope.

More food for thought: Mark Hamill is now the same age Alec Guinness was in A New Hope.

Source: Galaxy of Toys via Reddit