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It will be a game connecting past and future. That is why it is entirely based in Lumiose instead of a whole Kalos. GF wouldn't handle making whole Kalos. Probably some paradox-vibe Lumiose... GF and Nintendo likes to reuse ideas so probably it will be some kind of Zelda ToTK copy-paste with two map (just like in Zelda - with depths)
Z-A has many meaning - like AZ from Kalos, Area Zero (hexagons and Zygarde), but also Z-A which is backwards to alphabet. So probably some kind of way to time travel from the future to the past and vice versa.
+ we can see 5 arenas so probably a city will be as big, as a whole map.
I was waiting for some gen 2 or 5 game...not Kalos shit, but oh well... We will wait and see how will it turn out.