Three, three movie segments. 4, 5 and 6 to be the Rebellion...followed by 1, 2 and 3 to be the Clone Wars...with 7, 8 and 9 to be the further adventures of Luke Skywalker and his friends.
This was George's vision. I heard Lucas say this decades ago. He apparently grew tired of the whole mess but did decide to let someone else pick up the mantel. For a tidy sum I'm sure.
The tidy sum was reported to be $4 Billion.