To be precise, it would have been a Prequel Trilogy, a six episode version of the Original Trilogy with a few movies focused around Luke's sister who was initially a separate character from Leia and the two meeting with the defeat of the Emperor moved up, and a timeskipped trilogy with Luke passing the saber down to the next generation.
However, George's divorce lead to him wanting to get it over with and Return of the Jedi compressed some of those second trilogy plot elements together and just made Luke and Leia siblings.