Theory far from reality, with the teasers it has been shown that the filtered information of the film is all real ... And the story looked good.
The ships are obviously from Robotnik, but Sonic comes from his own world and not from the future.
Sonic travels as a child to the earth as a ring, the truth is that I wonder if he really does not travel because of the phantom ruby (since it has become something important in the saga and I do not understand even his motive). There he will meet Robotnik, an important being on earth and respected by all of which he will be increasingly obsessed by Sonic and his world.
The apocalyptic world of the teaser with Robotnik bald and red would be the final scene that is filtered, with Robotnik traveling to the world of Sonic for his obsession, more powerful than ever and with his big mustache (then leave behind his past to be called Eggman ).
The truth is that the filtered story looks great ... At last we will have the history of Sonic and Eggman's indices.
Everything has its logic and its because ... What I wonder is how will the following sequels in the world of Sonic ...