LuaJIT is usable as an interpreter on iOS, just not a jit compiler. It is a very fast interpreter, but obviously this is not ideal (and the ffi is slower without jit).
Android L is also going to kill jit compilers as well alas, see [1]
Yeah I liked LuaJIT for the amazing JIT performance and the super fast FFI it enables. Exactly the two things that wouldn't work in iOS. I had no idea Android L was killing JITs. It's a terrible precedent seeing how many dynamic languages depend on a JIT to perform decently.
Android L is also going to kill jit compilers as well alas, see [1]
[1] http://lwn.net/SubscriberLink/609511/53f3d97eed238d55/