Gloss injection refers to a molding process where the surface is smoothed out to give it a slight sheen. In person, it's not super glossy, but there's a bit of a shine to the surface. The molded colors have also been slightly changed overall.
Hmm.. still not super smooth, but there is some reflected light.
The yellow parts do sparkle a bit though.
The red parts have basically no shine at all..?? -_-a;
The white parts are decent enough — reasonably smooth.
True to its HGUC limited edition status, the assembly manual is a washed-out black-and-white job..