Michael Keaton, as Batman again? (Man of Steel II spoilers?)

Ok rumor lovers. What we know: The sequel to Man of Steel is going to be "inspired" by The Dark Knight Returns. Also director Zack Snyder has upcoming meetings with Frank Miller to discus the film (which is most likely titled: Superman Vs Batman).

Ok, NOW what is being rumored: That Mr. Snyder wants to cast an "older" (40+ year old) as Batman, and it will be a "Well Known" actor (most of this is coming from a latino review writer and from B.O.F.)
AND now there are many rumblings that none other than Michael Keaton my be up for it.
Which I suppose would mean M.O.S. takes place in a universe where Batman was already around, has retired but now is coming out of "hiding" to see what this new superhero alien is all about. Wow, I could actually get into that I think, thoughts?



Oh, and there is a Keep Calm and Call Batman poster in Man of Steel