From the post:
These expansion packs take you back to the very beginning of the Galactic Civil War, putting you directly in the desperate struggle over the plans to the Death Star. On one side, you can join up with Saw Gerrera and his partisans to take whatever actions you deem necessary to stop the spread of Empire. On the other, you could patrol the skies over Scarif in a TIE reaper, giving even the most experienced Rebel pilots pause before entering the fray.
No matter which side you choose, these expansion packs will help you usher in the next chapter of fast-paced space battles in the Star Wars galaxy with content from X-Wing Second Edition. Both the Saw’s Renegades Expansion Pack and the TIE Reaper Expansion Pack contain everything you need to convert their ships to second edition, giving you the opportunity to experience their raw power from launch.