Is this in the beta? (Korhal image)

[newcomplex]

Tarsonis was not a city planet like that. You can see it from orbit. You could not see the cities of Tarsonis from orbit. It covers the entire planet, Tarsonis's city did not. As for Brontes, please provide more information.

There is also a huge difference between developed and a freaking city planet. Your talking about the entire 100% of its surface being covered in a urban environment.

We see brontes in the comics. It is clearly a highly developed, multilayed city where transport is primarily done through hovercars (which suggests infrastructure similar to this), though we are never given an orbital view.

[mr. peasant]

Because its a multiplayer map, and lore is of little concern. Their was obviously no in depth discussion in order to discern the location of a out of canon ladder map for the Beta. I highly doubt Metzen was involved in its design.

While Metalopolis is 'just' a multiplayer map, you must realize that the map designers don't just do multiplayer maps. They also design and script the campaign maps. And it's from here that they'd know which planets are which. I highly doubt there are so many different teams so that one just builds maps while another scripts the events while a third just inserts the loading screens (which is what the artworks are for).

Moreover, here's something to ponder over: Do you think that the map designers are going to receive a stack of untitled art? Obviously, the art department would title/label each piece for easy referencing. These titles would then be used in all departments. I highly doubt that that the map designers can/would simply pluck a name at random when labeling individual elements in the game's engine.

[n00bonicPlague]

Strange that the planetary ring formed from the debris of the original nuking is completely gone.

Perhaps they mined it all out and filled in the craters and whatnot.