Yeah, a lot of people were just assuming it was supposed to be Ishgard or something because that was the only Adventurers' Guild we haven't seen.
I'm pretty sure it was originally designed after this
early 'Rapture' concept art.
I think the only thing that doesn't quite line up from the introduction cinematic and the actual game is the design of Mor Dhona. The glimpse they show you of the Silvertear Falls area looks geographically nothing like actual Mor Dhona. I know it's supposed to be all dried up and lifeless since the Echo scenes, but Mor Dhona's terrain couldn't have had all the waterfalls and shit that they show before the Malboro battle.
When will they learn that players want to eventually explore and play in areas that are showcased in cutscenes, intros, demos, etc. This is why playing the secret intro/demo level in Super Mario World was such a damn treat. This is why the complete lack of Tavnazia proper in FFXI is such a kick in the pants.