While I don't think any of the five names being bandied about are right on I think you can guess my preference of the five, given the above image and my well-documented predilections, for which one I'd choose to play Elvis in Baz Luhrmann's forthcoming biopic. The five actors are Aaron Taylor-Johnson, Miles Teller, Harry Styles (I hesitate to call him an actor -- and don't yell "Dunkirk" at me, nobody had to act in that movie), Ansel Elgort, and Austin Butler.
The only one of them I don't know is the latter, although I've seen his name around; the other three are either a firm no thank you (Teller and Elgort) or an "I suppose, if you must" (Styles). But I'm not nuts about any of them to be honest, even Aaron who feels a little old at this point? (Which is probably crazy cuz dude is only 29.) Anyway...