South Dakota is confirmed it is the next state after Illinois because Louisiana releases in a couple of weeks. Mississippi can't be released because of Louisiana is not in the game yet and SCS rules say you do not release the next state in that area after the previous state has been released. That means Mississippi comes after South Dakota in release order.
It's not Minnesota because in order to attach Minnesota you need Wisconsin you need North Dakota and you need South Dakota none of those states are in the game so Minnesota is not an option.
Wisconsin same reason why Minnesota is not coming up yet you need Illinois and you also need North and South Dakota before you add that state.
And Indiana and Ohio forget about it those won't be added until the end of 2027 Illinois needs to be polished first before you add those States and they have nothing to anchor them so they won't be coming anytime soon.
North Dakota cannot be added without South Dakota and the SCS rule about adding a state next to a previous release date still applies so this one will come after Mississippi but before Wisconsin is added.