Yes, these are the Batmen you've been looking for. DC has released the first four covers for their upcoming Return of Bruce Wayne series, featuring the original Batman in all manner of different time-appropriate outfits. Click for full-size genius.
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Now, we all know Batman doesn't use guns, but what about that axe in Cavebatman? Wouldn't that be the equivalent of a missile launcher today?
If he can't take a Neanderthal out with cave kung-fu, he isn't the real deal.