Hello all! First, thanks for the question naelian and Ashley for the insightful comment. As Ashley mentioned the CocoonJS Launcher is mainly used to test your development directly on the device, you can think of it as a "simulator" except you can see it running on the physical device itself.
Fortunately, CocoonJS does not have a special SDK, because it conforms to the HTML5 stack. This ultimately means 3 big things:
1) You don't have to learn anything special or go through a documentation
2) You can use any HTML5 compliant testing environment you wish (Chrome, Mozilla, etc)
3) If it works on the browser it would most likely work on CocoonJS (maybe some minor changes)
We're hoping the CocoonJS launcher will be approved anytime soon so that testing and debugging can be easier for you guys. But again, we are working on a cloud compiling system so anyone would be able to get a Xarchive or APK build. Hope that helps!
Also, Ludei now has it's own Forum for CocoonJS specific questions: