First Point: It is stated that the images presented do not correspond to those of the game, so we should not relate this, visually, to anything presented in the trailer.
Second Point: The Trailer refers to the Lumiose City urban development plan. Drawing a historical parallel, I believe the game is referring to Haussmann's renovation of Paris which took place between 1852 and 1870. Therefore, I think the game will have a setting based on that period. In fact, we can see that the city's first scribbles have a 19th century style.
On the other hand, I believe that the technological city that is shown to us is the current city of Lumiose, or rather, the result of the proposed urban plan that transformed the place into the main hub of the region.
Well, it could, of course, be the opposite, that is, that in the future the protagonist will discover secrets related to the city's project from centuries ago. We have to wait and see.
NOTE: This trailer has an extreme focus on Lumiose City so I wonder if we will have other cities in the game, or if this will only be focused on the capital and its surroundings.
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