The Rogue One DLC Pack has released for LEGO: Star Wars The Skywalker Saga and adds seven characters from the original Star Wars story. For players that purchased the Deluxe Edition of LEGO: Star Wars or the Character Collection DLC will automatically have the Rogue One DLC pack. The Rogue One DLC Pack is also available for $2.99 as an add-on to the base game.
The Rogue One DLC Pack includes the Rogue One characters equipped with their unique weapons. Here are all the characters and their weapons:

Related:How to complete Mouse Droid Hunt Challenge in LEGO Star Wars Skywalker Saga
While the character DLC does not add any story missions, seeing characters from the original Star Wars story is very cool. Unfortunately, the characters do not have voice lines but do have unique animations.

If you have the Deluxe Edition of Star Wars: The Skywalker Saga or the Character Collection, the download should start automatically, but if it does not, go to the game tile and select updates or manage the game on your console. The update should be there, and if it is not, you may have to restart your console and reconnect to the internet.
For more LEGO guides, check outWhat missables are there in LEGO Star Wars Skywalker Saga?on Pro Game Guides.