I was able to ask Matt some questions about Hossin that are somewhat irrelevant now since everyone can see it
But I asked him if they applied everything they learned from the Indar redesign and the Esamir redesign and he said they went back and retooled it numerous times before releasing what you are seeing now. Additionally it looks like they are going to do a "phased release" of the continent to get feedback along the way before full release.
I was able to observer cam around it a bit the day it released and I must say it was extremely impressive. It's not vehicle friendly overall, but vehicles will still have a role. I cannot wait to play Infiltrator on this map.