We now know for a fact that at the very least, Krystal will at some point in the first player mode as a Star Fox team member in Star Fox Command. Wether or not she will be playable is not yet known, but is highly probable since other characters appear to be playable through ship selection screens. Ksathra found this out by taking a close look at a screenshot from Famitsu.com. Read about it here.

More new fanart!
http://www.deviantart.com/view/35762017/
http://www.deviantart.com/view/35763205/
http://www.deviantart.com/view/35824239/
http://www.deviantart.com/view/35831563/
http://www.deviantart.com/view/35829167/
http://www.deviantart.com/view/35860424/
http://www.deviantart.com/view/35833429/
http://www.deviantart.com/view/35861421/

Edit:
I forgot to mention, Ksathra also made me aware of a high-res wallpaper from Star Fox Command. It was released as a prize for entering a contest at MyNintendo. See it here.

Edit 2:
Also forgot to mention, I’m starting initial testing for a very special project for all you Krystal fans. It’s not as big a deal as I’m making it sound, but I want to keep it a secret until I have a reasonably complete version for you to see.