Originally Posted by I, Brian
I always tended to take it as simply meaning "Return of the Jedi" - ie, the Jedi banished from the galaxy, but now returning as a balancing force under Luke Skywalker, who at present *is* the Jedi.
It's also worth noting that the original title was "Revenge of the Jedi", and I remember seeing the early merchandising with that, which points very much to Luke Skywalker again, rather than the redemption of Anakin.
Quite true! I recalled looking at a coming-soon poster and it said, "Revenge of the Jedi", but prior to its release, it was quickly changed. One thing is certain, all of those merchandise with the Revenge of the Jedi label are quite valuable today.