Sure, that could be a pro of RubyMotion, but then that's not the goal.

I develop in Objective-C as well, and I am very interested in what RubyMotion will bring to the table. So far, what I've seen is typical Objective-C code translated to Ruby. That doesn't offer me any advantage. What I want to see is something that will significantly boost productivity. REPL seems like one of them, but I want to see something on the code level.