This morning during an interview with Good Morning America Andor, Diego Luna revealed that the series has been pushed back to September to accommodate a 3-episode premiere, rather than the previously announced 2-episode premiere which was set to arrive on August 31st. Now, the Rogue One prequel series will debut on Disney+ on September 21.
"Andor is set during the early days of the rebellion and will focus on Cassian Andor's revelation that he can make a change in the galaxy. According to the official description of the series, it "brings forward the tale of the burgeoning rebellion against the Empire and how people and planets became involved. It’s an era filled with danger, deception and intrigue where Cassian will embark on the path that is destined to turn him into a rebel hero."