Rokon, a nice 2D game library that’s been around for quiet some time now has Box2D support. They took the JNI wrapper from libgdx and integrated it with their lib. Way to go! Here’s a demo video
I was hoping for some sort of collaboration, e.g. porting rokon to libgdx so you can also run on the desktop for rapid development but for now this seems to be not an option. Oh well, at least something in libgdx was useful to someone.