I'm just weary of "definitive editions" for films that have been released on DVD some 4 or 5 times already. 

As far as Eisenstein re-discovery couldn't disagree more. I like the man's work but he's so much of an institution in film that his work loses its original power. His films, Potemkin more than any other, have been dissected so often that watching the films sometimes feel more like homework. I realize this is also the case with Welles and Citizen Kane.