Technical: You should add storm cover for the zippers, wrist guards, and a snowskirt/jacket-to-pant interface along with your own pants.
Also, a zip-off-sleeve option would be very cool! Puffy and 20k/20k for the backcountry guys as an option would be a good addition, too.
(There are of course even more, like removable hood/music pocket/goggle pocket/left arm ticket pocket and so on...)
Colourways: Maybe you should add khaki/beige to your colours, these sell really good right now (and look good!)
Design: I think it would be awesome if you guys had like different patterns, like a square-2-colour-patterns, or the typical asymmetric look (3 triangles, basically), or a flannel look and so on... would also add alot of variety and a lot more customizability...