Stephen Stanton, the voice actor who portrayed Admiral Wilhuff Tarkin in Star Wars: The Clone Wars, has revealed that now-Grand Moff Tarkin will appear in "Call to Action," next week's episode of Star Wars Rebels:
In the episode, Tarkin travels to Lothal after the Imperial forces there have failed time and time again to defeat the rebellious crew of the Ghost. Tarkin makes some changes to Imperial operations on Lothal, and the Empire undertakes an operation to eliminate the rebels once and for all—both as an insurgent force and as a symbol of hope.
"Call to Action" is currently available on WatchDisneyXD.com and the WatchDisneyXD app. It will premiere on Disney XD next Monday, February 9, 2015.