Big Blue Boyscout
Yeah, I do get that Man of Tomorrow sounds retro. It makes me think of Tomorrowland or that Sky Captain movie. But I still like the sound of it.
Other options:
Man of Krypton
Man of Metropolis
Man or Superman
Sequel of Steel
U.S. Steel
Man of Steelton, PA
Man of Tomorrow of Steel
Last Son of Steel
Michael Steele Sucks
Brilliant!
Others...
The Other Caped Crusader
The Bright Knight
Man of Super
Superman: The First Justice Leaguer
World's Finest Man
Man of Steel and Girl of Steel
Superman: Sequel to Man of Steel Just in Case Superman in the Title Didn't Make it Clear That This Movie is a Man of Steel Sequel