Writing code in native c*+ means that you don’t get higher level features such as reflection and serialization. From what I’ve read it seems that Angelscript would allow both of these features while keeping a syntax that is VERY similar to c*+ (easy script migration). A new engine released called GRACE2 is using Angelscript on many platforms, so I believe that it is possible to implement.
I’ll eventually try to implement it on my own (no spare time at the moment). Is this a feature that the Cocos2d-x development team would consider for a future version?