Board Thread:Questions and Answers/@comment-26331236-20150421231439/@comment-5774380-20150421233522

Yeah, many things are changed. Armin has black hair, and so far the only characters from the series revealed in the cast are him, Eren, Mikasa, Jean, Sasha and Hange; all the others are absent and/or were replaced by original characters.

Levi specifically was replaced by a new character called Shikishima (you can see him in the gallery), who holds his title of the strongest soldier.

This movie is just intended to be based in the series, not to be a faithful adaptation.