I think it's quite good looking. I think the Si in the sedan form has potential to be a really good looking car. Plus, the "more powerful engine options” as pointed out above really has my gears turning!
I'm not sure I can really tell if this odd looking bulge is on the prototype. Other than that, I really do like how I blends some of the elements from the 10G like the coupe style taillights and aggressive front fascia.
I've gotta admit that the mockup with the paint colors does look quite nice. Give the si some nice wheels, a nice spoiler, good looking exhaust, and an upgraded 1.5t, and we might be onto something. Also, with only two body styles it would be epic to have a Type-R sedan.
Never been a big fan of any car from patent images. They almost always look better with real wheels, paint, and comparing with a background. One thing is for sure... this civic will probably continue to handle very well, be very fuel efficient, and still fun.