Hark! Coding!
these will more than likely be added in the future. Keep in mind that IT too was bare like this (actually more bare) when it first came out as well. Also the release date of the game was pushed because of everyone wanting to play so badly, so not much more could have been added. But yeah, they will probably be added in future updates. Im al for the prey and Dims myself honestly. though really if you want more maps, you can always download some ~Jinchuuriki
If I may ask, what is a Dim?
Dimensions were in IT, they were like different servers, I guess? If your friend was in dim 1 and you were in Dim 2, even if you were in teh exact same spot you couldn't see each other.