Their appearance deliberately kept a secret for the most part prior to the release of Return of the Jedi, as Yoda had been for The Empire Strikes Back in 1980, some images of the Ewok (first called Ewaks) creatures of the forest moon of Endor, via conceptual designs by Joe Johnston, did make it to specific trusted sources in licensing and advance publicity planning beyond the confines of Lucasfilm, as seen here with these very rare production still duplicates of the furry warriors. We assume that this was when the film was in its post January 1983 locked-in title phase, though some transparancy holders with the titular Revenge of the Jedi were used that still bore that original title.
