When the Star Wars anthologies—now Star Wars stories—were announced, the intention would be that they were standalone, one-off films. They told a story, whether it was the theft of the Death Star plans, or the early life of Han Solo, and then were done. But a new rumor suggests that at least one Star Wars story could develop into its own franchise.
Source: Gizmodo – Does Disney Have Plans for a Whole Han Solo Prequel Trilogy?