We're used to seeing this world environment in its incarnation as Lothal for STAR WARS REBELS, but before that this grass plains world of Sicemon was originally home to the Rebel Alliance before its attack on the second Death Star, for REVENGE OF THE JEDI. during early conception in 1980, whilst the story was still being flux formulation by Lucas.
As we all know by now, unused classic art and concepts are always looked over anew for future SW productions, especially linked to Joe Johnston and Ralph McQuarrie.
