I think Scion is good with keeping to the Concept model's proportion, just everything else will most likely be changed and toned down a lot if the iA's concept and production models are anything to go by.
Here's a picture of 6 2015-2016 subcompact crossovers: Nissan Juke SL, Subaru XV Crosstrek, 2015 Chevrolet Trax LT, 2016 Honda HR-V, 2015 Jeep Renegade Latitude, and the 2016 Mazda CX-3. They all have four doors. Maybe Toyota will follow the majority and come out with 4 doors too.
Since it's a city rider and not designed for long road trips, I don't think Scion is going to put much thought into the rear middle seat. The iR is supposed to seat 4 or more persons but the fifth rider who has to sit in the middle is usually cramped and uncomfortable in most cars. Think Scion will address this in a city vehicle?
The only way to address this is to increase the width of the car for more horizontal space. Maybe an inch or two. May not see like a lot but it does make a difference in seating comfort.
Not sure if Scion considers this important enough to warranty their attention.
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