I've installed ReactNative Playground from AppStore, trying to figure out, what Development Server url should I use to make this thing work?
I've figured it out, hopefully.
If you need to check out specific version of React Native, use rninit package:
$ rninit init [Project Name] --source firstname.lastname@example.org
Don't forget, that RNPlay is bundled with some native packages, thus, you cannot use custom ones, only js-packages.