According to George Lucas, Jedis don't seek revenge. But, for almost all of the development of Return of the Jedi, they did. The trailers, posters, and even some early promotional merchandise said so. I can remember having to un-learn the title as a kid, in anticipation of the film's release.
The word "revenge" was eventually used for Episode III: Revenge of the Sith, as a nod and a wink to Return of the Jedi's original title. I've tried to think of an instance that would prove Lucas wrong, some instances of Jedi revenge, but the only moment I can think of where a Jedi actually seeks personal retribution is the moment in Episode II when Anakin slaughters the Tusken Raiders. Considering Anakin is on the Sith career path, I guess Lucas is right (and unusually airtight -- the prequels, if anything, are full of contradictions.)
You can view the poster in full after the jump.