Stealth could be fun! As long as there are other abilities tossed in.
Maybe to change color you would have to use a sort of Eyedropper tool from the surrounding area using the Wii U game pad, then the character would change. If yo picked the wrong color you wouldn't be camouflaged enough for enemies to look over you. Of course for the PC version you could use a crosshair.
This would also make sense why they said "And for everyone asking why we didn't introduce our new heroes today - we did. Didn't you see them?" on Twitter, they were simply playing at the idea of this camo ability.
This of course has already been discussed, but sometimes it's good to restate things.
Animation and Computer Science Major at Ball State University
"Ahoooooooooyeeee! ooooh oooh oh" - Kazooie