I don't get why people don't want to see Unova again. I want to see how it has developed after bw2. We might finally get to see a grown up Iris and not a little Iris in a big dress .
Anyway, why are people assuming that this region is a far away one like Unova. The sign-post with the number 3 doesn't have to be the Route Number. It could just signify the distance to the next city or something
Or if that is a route number, that could be route 3 of Unova ( albeit changed because of different time frames ).