Come on we went through this with the TDK trilogy. Just like "the dark knight" became the overall name for the series and thus we got The Dark Knight Rises.
I'm positive they will be keeping Man of Steel as the overall title with some verb attached afterwards. Superman will be just like Batman for the nolan series, something they got rid of in the title to distinguish it from past series.
Last son of Krypton is also awesome but would need to revolve around a story relating back to Krypton... Would even have been an awesome title instead of MOS
'Superman'. Simply put, WB need to convince people the sequel will bring them the Superman character so many wanted to see in MoS but didn't get. The sequel can be where his character arc continues onto the role of an actual super hero, using more of the conventions in Superman stories, thus earning the people of Metropolis' trust, and becoming the Superman we know and love, hence the name of the film. I hope anyway.
'Superman'. Simply put, WB need to convince people the sequel will bring them the Superman character so many wanted to see in MoS but didn't get. The sequel can be where his character arc continues onto the role of an actual super hero, using more of the conventions in Superman stories, thus earning the people of Metropolis' trust, and becoming the Superman we know and love, hence the name of the film. I hope anyway.