I can kind of see Eisenberg, in the mold of the character he played in Social Network. Luthor as young, petulant genius, as opposed to what we've traditionally seen. It could work. It depends entirely on the story. Luthor as a corporate threat to Bruce Wayne could be the way these two cross paths. Jeremy Irons has always been a tremendous actor, and him as Alfred offers some new avenues. Could work. would not have been the route I would have gone, but then none of these choices so far have been, so par for the course. We'll see.