I was encouraged by the indoor portions. Gave me the sense that the overworks will be, if not the tip of the iceberg, at least a broad over layer on top of some more unique environments.
That said, I'm a bit concerned we didn't see any alternative biomes. The benefit of a semi-open world structure like Dragon Age Inquisition is how easy it is to provide varied types of environments (because you don't need to create/ justify the in-between transitional areas). So it would have been nice to see desert/ice/swamp biomes with distinct enemy / gameplay types.
Also, every time Chief gets into a Banshee I wonder how they're going to make that not game-breaking. Like, what will stop you from not going just wherever?