The jellybean weighs within EVO X territory without the all-wheel drive hardware. With the all-wheel drive hardware, the extra differentials and etcetera, it's bound to weigh more.
The rear seats are awful. I understand that they're only there because... but they're awful.
Aside from that, the cabin is still cramped compared to the Evo X, with that stupidly large center console and intrusive dashboard and low-slung ceiling. Competitors like the Genesis Coupe are a paragon of useability in comparison. Hell, the old Hyundai Coupe had better seating space, and that was a smaller car!
If ever an Eclipse EVO ends up being lighter than a regular EVO X, it still won't be as spacious... and an EVO X RS variant built with the same level of weight savings would still be lighter... and would perform better.