...and because C2 is portable, you'll be able to prototype your game even when not on your computer. I use PS for drawing, but I like CC has it's own editor so I can still work on my game when I'm not at home.
Well there's plenty of image editors that can be done the same way. Gimp Portable is less than 30 megs.
Anyway that wont be forever, since paid versions will have to be tied to specific computers.
You wouldn't want a bunch of fully functioning versions flying around on zip cards... even tho that would be pretty cool to have.
Given the added functionality of drag, and drop of sprites on the editor, why not just skip the image editor part all together? Then if you must, have the animator, hotspot, and imagepoint editor all in one.