Is Concordia In A Separate Dimension?
So people have hypothesized that Concordia from Mario & Luigi: Brothership takes place in another dimension, based on them getting sucked into a portal as seen in the trailer. To me this is too similar to how people assumed Lake Lapcat and the Sprixie Kingdom were in different dimensions, and I don't think this is the case. So here's my reasonings on why.
So in the trailer we see a Prize Block on one of these islands. Why is this notable??? Well..... Blocks are established to be constructed of various materials giving them distinct looks as I mentioned in a previous post. By extension blocks like the Question Mark Blocks are exclusive to the Mario World, and this would place the Concordia on the same planet.
The second thing the trailer we see is what appears to be a relative of the Treevil. As far as I'm aware we have only seen Treevils running around Dimble Woods which is part of the Mushroom Kingdom. Since we see this Treevils relative I believe it would imply this is still the same planet.
The third thing is we see Mario and Luigi using a Koopa Shell for a Bros Attack. Depending on how this story goes, if the Bros happen to find or buy the shell in Concordia. This would mean this is more than likely the same planet.
But the final piece of evidence is some major stuff we see in a trailer. While Mario and Luigi got here by being sucked into a portal, we see Peach and Bowser get here in a different way. We see Peach getting to Concordia riding on a Dorrie while we see Bowser flying here using his Clown Car and airships. This would heavily imply this is part of the Mushroom World. Where exactly is Concordia on the map? Well we will have to wait for the game to come out.